Hide only table and show graphs for statistics.

app/views/exercises/statistics.html.slim

@@ -24,7 +24,7 @@ h1 = @exercise
 = row(label: '.average_worktime') do
   p = @exercise.average_working_time
 
-- Hash[:internal_users => t('.internal_users'), :external_users => t('.external_users')].each_pair if current_user.admin? do |symbol, label|
+- Hash[:internal_users => t('.internal_users'), :external_users => t('.external_users')].each_pair do |symbol, label|
   strong = label
   -if symbol==:external_users
     -working_time_array = []
@@ -38,6 +38,7 @@ h1 = @exercise
     hr
     div#chart_2
     hr
+  - if current_user.admin?
     .table-responsive
       table.table.table-striped.sortable
         thead