var groupedTag = records.GroupBy(r => r.TagName);

            var winner = groupedTag.OrderBy(GT =>
           {
               float finalChange = 0.0f;
               foreach (var item in GT)
               {
                   float thisItem = (float)item.QuestionCount / (float)item.YearTotalCount;
                   var nextItem = GT.Where(i2 => item.Year + 1 == i2.Year).FirstOrDefault();

                   if (!object.Equals(nextItem, default(YearlyQuestionData)) && nextItem.Year != 2017)
                       finalChange += (float)(((float)nextItem.QuestionCount / (float)nextItem.YearTotalCount) - (float)thisItem);
               }

               return finalChange;
           }).Reverse().Take(5);

            foreach (var item in winner)
            {
                Console.WriteLine(item.FirstOrDefault().TagName);

                foreach (var item2 in item)
                {
                    Console.WriteLine($"{item2.Year,-5} | {((float)((float)item2.QuestionCount / (float)item2.YearTotalCount)).ToString(".0####"),-7} | {item2.QuestionCount}");
                }
            }