fixing years on school page

app/controllers/schools_controller.rb

@@ -11,7 +11,7 @@ class SchoolsController < ApplicationController
     authenticate(district.name.downcase, "#{district.name.downcase}!")
 
     @school_categories = @school.school_categories.for_parent_category(@school, nil).valid.sort
-    @years = @school_categories.map(&:year).map(&:to_i).sort
+    @years = @school_categories.map(&:year).map(&:to_i).sort.uniq
     @year = (params[:year] || @years.first).to_i
     @years.delete(@year)
     @school_categories = @school_categories.select { |sc| sc.year.to_i == @year }