diff --git a/swad_changelog.h b/swad_changelog.h
index 92581463..f55ca44d 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -492,7 +492,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 19.112.20 (2020-01-07)"
+#define Log_PLATFORM_VERSION	"SWAD 19.112.21 (2020-01-07)"
 #define CSS_FILE		"swad19.112.css"
 #define JS_FILE			"swad19.91.1.js"
 /*
@@ -502,6 +502,7 @@ ps2pdf source.ps destination.pdf
 // TODO: Mapas más estrechos en móvil
 // TODO: Quitar todos los EXTRA_DATA.
 
+	Version 19.112.21:Jan 07, 2020	Optimization in number of degrees in a country. (278741 lines)
 	Version 19.112.20:Jan 07, 2020	Optimization in number of courses in a country. (278724 lines)
 	Version 19.112.19:Jan 07, 2020	Optimization in number of users in a country. (278675 lines)
 	Version 19.112.18:Jan 07, 2020	Optimization in number of users in a country. (278668 lines)
diff --git a/swad_country.c b/swad_country.c
index b03765c8..39b1f1e3 100644
--- a/swad_country.c
+++ b/swad_country.c
@@ -428,7 +428,7 @@ static void Cty_ListOneCountryForSeeing (struct Country *Cty,unsigned NumCty)
    HTM_TD_End ();
 
    HTM_TD_Begin ("class=\"DAT RM %s\"",BgColor);
-   HTM_Unsigned (Cty->NumDegs);
+   HTM_Unsigned (Deg_GetNumDegsInCty (Cty->CtyCod));
    HTM_TD_End ();
 
    HTM_TD_Begin ("class=\"DAT RM %s\"",BgColor);
@@ -844,7 +844,7 @@ void Cty_GetListCountries (Cty_GetExtraData_t GetExtraData)
                   Cty->WWW[Lan][0] = '\0';
         	 }
                Cty->NumUsrsWhoClaimToBelongToCty.Valid = false;
-               Cty->Inss.Num = Cty->NumCtrs = Cty->NumDegs = 0;
+               Cty->Inss.Num = Cty->NumCtrs = 0;
 
                /* Get the name of the country in current language */
                Str_Copy (Cty->Name[Gbl.Prefs.Language],row[2],
@@ -871,9 +871,6 @@ void Cty_GetListCountries (Cty_GetExtraData_t GetExtraData)
 
                /* Get number of centres in this country */
                Cty->NumCtrs = Ctr_GetNumCtrsInCty (Cty->CtyCod);
-
-               /* Get number of degrees in this country */
-               Cty->NumDegs = Deg_GetNumDegsInCty (Cty->CtyCod);
                break;
            }
         }
@@ -1001,7 +998,7 @@ bool Cty_GetDataOfCountryByCod (struct Country *Cty,Cty_GetExtraData_t GetExtraD
       Cty->WWW[Lan][0] = '\0';
      }
    Cty->NumUsrsWhoClaimToBelongToCty.Valid = false;
-   Cty->Inss.Num = Cty->NumCtrs = Cty->NumDegs = 0;
+   Cty->Inss.Num = Cty->NumCtrs = 0;
 
    /***** Check if country code is correct *****/
    if (Cty->CtyCod == 0)
@@ -1376,6 +1373,7 @@ void Cty_RemoveCountry (void)
       /***** Flush cache *****/
       Cty_FlushCacheCountryName ();
       Ins_FlushCacheNumInssInCty ();
+      Deg_FlushCacheNumDegsInCty ();
       Crs_FlushCacheNumCrssInCty ();
       Usr_FlushCacheNumUsrsWhoClaimToBelongToCty ();
 
@@ -2080,7 +2078,6 @@ static void Cty_EditingCountryConstructor (void)
    Cty_EditingCty->Inss.Lst = NULL;
    Cty_EditingCty->Inss.SelectedOrder = Ins_ORDER_DEFAULT;
    Cty_EditingCty->NumCtrs = 0;
-   Cty_EditingCty->NumDegs = 0;
    Cty_EditingCty->NumUsrsWhoClaimToBelongToCty.Valid = false;
   }
 
diff --git a/swad_country.h b/swad_country.h
index d9f35137..33d15e54 100644
--- a/swad_country.h
+++ b/swad_country.h
@@ -58,8 +58,6 @@ struct Country
       Ins_Order_t SelectedOrder;
      } Inss;
    unsigned NumCtrs;
-   unsigned NumDegs;
-   // unsigned NumCrss;
    struct
      {
       bool Valid;
diff --git a/swad_degree.c b/swad_degree.c
index c2bb7e89..4059c66b 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -1860,16 +1860,32 @@ unsigned Deg_GetNumDegsTotal (void)
 /********************* Get number of degrees in a country ********************/
 /*****************************************************************************/
 
-unsigned Deg_GetNumDegsInCty (long InsCod)
+void Deg_FlushCacheNumDegsInCty (void)
   {
-   /***** Get number of degrees in a country from database *****/
-   return
+   Gbl.Cache.NumDegsInCty.CtyCod  = -1L;
+   Gbl.Cache.NumDegsInCty.NumDegs = 0;
+  }
+
+unsigned Deg_GetNumDegsInCty (long CtyCod)
+  {
+   /***** 1. Fast check: Trivial case *****/
+   if (CtyCod <= 0)
+      return 0;
+
+   /***** 2. Fast check: If cached... *****/
+   if (CtyCod == Gbl.Cache.NumDegsInCty.CtyCod)
+      return Gbl.Cache.NumDegsInCty.NumDegs;
+
+   /***** 3. Slow: number of degrees in a country from database *****/
+   Gbl.Cache.NumDegsInCty.CtyCod  = CtyCod;
+   Gbl.Cache.NumDegsInCty.NumDegs =
    (unsigned) DB_QueryCOUNT ("can not get the number of degrees in a country",
 			     "SELECT COUNT(*) FROM institutions,centres,degrees"
 			     " WHERE institutions.CtyCod=%ld"
 			     " AND institutions.InsCod=centres.InsCod"
 			     " AND centres.CtrCod=degrees.CtrCod",
-			     InsCod);
+			     CtyCod);
+   return Gbl.Cache.NumDegsInCty.NumDegs;
   }
 
 /*****************************************************************************/
diff --git a/swad_degree.h b/swad_degree.h
index 8faa88d6..e1f4edcc 100644
--- a/swad_degree.h
+++ b/swad_degree.h
@@ -140,7 +140,8 @@ void Deg_ReceiveLogo (void);
 void Deg_RemoveLogo (void);
 
 unsigned Deg_GetNumDegsTotal (void);
-unsigned Deg_GetNumDegsInCty (long InsCod);
+void Deg_FlushCacheNumDegsInCty (void);
+unsigned Deg_GetNumDegsInCty (long CtyCod);
 void Deg_FlushCacheNumDegsInIns (void);
 unsigned Deg_GetNumDegsInIns (long InsCod);
 void Deg_FlushCacheNumDegsInCtr (void);
diff --git a/swad_global.c b/swad_global.c
index 6d0a1d27..e1353ccc 100644
--- a/swad_global.c
+++ b/swad_global.c
@@ -408,6 +408,7 @@ void Gbl_InitializeGlobals (void)
    Ins_FlushCacheFullNameAndCtyOfInstitution ();
 
    Ins_FlushCacheNumInssInCty ();
+   Deg_FlushCacheNumDegsInCty ();
    Crs_FlushCacheNumCrssInCty ();
 
    Dpt_FlushCacheNumDptsInIns ();
diff --git a/swad_global.h b/swad_global.h
index 523be7d3..8c8cac34 100644
--- a/swad_global.h
+++ b/swad_global.h
@@ -788,6 +788,11 @@ struct Globals
 	 long InsCod;
 	 unsigned NumCtrs;
         } NumCtrsInIns;
+      struct
+        {
+	 long CtyCod;
+	 unsigned NumDegs;
+        } NumDegsInCty;
       struct
         {
 	 long InsCod;