Database: authors
Question: Calculate the differences of the paper number with the journal name of IWC in 2000 and 2010.
SQL: 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'