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set nocount on 

declare @VoteStats table ([year] int,up int, down int) 

insert @VoteStats
select
    [year] = datepart(yy,Votes.CreationDate),
    up = sum(case when VoteTypeId = 2 then 1 else 0 end), 
    down = sum(case when VoteTypeId = 3 then 1 else 0 end)
    from Votes inner join Posts ON (Posts.id = Votes.PostId)
where VoteTypeId in (2,3) and PostTypeId = 1
group by datepart(yy,Votes.CreationDate)

set nocount off

select [year],(100 * down/up) as percentage, up, down from @VoteStats order by [year] desc

fork query

edited mar 26 13

created mar 25 13 MandoMando