diff --git a/app/models/sheet_year.rb b/app/models/sheet_year.rb
index 285942f..a0a82d4 100644
--- a/app/models/sheet_year.rb
+++ b/app/models/sheet_year.rb
@@ -11,10 +11,10 @@ class SheetYear < ActiveRecord::Base
   
   
 	 after_save do
-		sy = self.sheet.sheet_years.find(:first, :order => "year DESC")
+		sy = self.sheet.sheet_years[0]
 		if sy
 			self.sheet.last_year = sy.year
-			self.sheet.first_year = self.sheet.sheet_years.find(:first, :order => "year ASC").year
+			self.sheet.first_year = self.sheet.sheet_years.reverse[0].year
 			
 
       if sy.plume
@@ -35,10 +35,10 @@ class SheetYear < ActiveRecord::Base
 
 
 	after_destroy do
-		sy = self.sheet.sheet_years.find(:first, :order => "year DESC")
-	    if sy
-  			self.sheet.last_year = sy.year
-  			self.sheet.first_year = self.sheet.sheet_years.find(:first, :order => "year ASC").year
+		sy = self.sheet.sheet_years[0]
+		if sy
+			self.sheet.last_year = sy.year
+			self.sheet.first_year = self.sheet.sheet_years.reverse[0].year
   			
 
         if sy.plume