What's going up, what's going down

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DECLARE @AnnualPosts TABLE
(
  y int,
  numPosts int
)

INSERT INTO @AnnualPosts (y, numPosts)

  select year(CreationDate), count(id)
  from Posts
  where answerCount + CommentCount > 0
  group by year(CreationDate)

DECLARE @TopTags TABLE
(
  tagId int,
  tagName varChar(32),
  usage_15_16 int, 
  usage_15 int, 
  usage_16 int
  
)

INSERT INTO @TopTags (tagID, tagName, usage_15_16, usage_15, usage_16)

  select top 100 t.id tagId, t.tagName, count(p.id) postCount, 
  sum (case when year(p.creationDate) = 2015 then 1 else 0 end) usage2015, 
  sum (case when year(p.creationDate) = 2016 then 1 else 0 end) usage2016 
  from tags t
  join PostTags pTags on pTags.tagId = t.id
  join Posts p on pTags.postId = p.id
  where year(p.creationDate) in (2015, 2016)
  group by t.Id, t.tagName
  order by count(p.id) desc 
  
select topTags.*, annualPosts.* 
from @TopTags topTags
join @AnnualPosts annualPosts on annualPosts.y  = 2015

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