Calculate the differences of the paper number with the journal name of IWC in 2000 and 2010.
"IWC" is the ShortName of journal;  '2000' and '2010' are Year;  Difference = Subtract(Count(Paper.Id(Year = 2000)), Count(Paper.Id(Year = 2010)))
SELECT SUM(CASE WHEN T2.Year = 2000 THEN 1 ELSE 0 END) - SUM(CASE WHEN T2.Year = 2010 THEN 1 ELSE 0 END) AS DIFF FROM Journal AS T1 INNER JOIN Paper AS T2 ON T1.Id = T2.JournalId WHERE T1.ShortName = 'IWC'
database name:db_id authors
Author table Author Cols: Id dtype integer, Name dtype text, Affiliation dtype text, 
Conference table Conference Cols: Id dtype integer, ShortName dtype text, FullName dtype text, HomePage dtype text, 
Journal table Journal Cols: Id dtype integer, ShortName dtype text, FullName dtype text, HomePage dtype text, 
Paper table Paper Cols: Id dtype integer, Title dtype text, Year dtype integer, ConferenceId dtype integer, JournalId dtype integer, Keyword dtype text, 
PaperAuthor table PaperAuthor Cols: PaperId dtype integer, AuthorId dtype integer, Name dtype text, Affiliation dtype text, 
