Write SQL query to solve given problem: Calculate the differences of the paper number with the journal name of IWC in 2000 and 2010.. Keep the solution inside sql tag ```sql [SQL-Query] ```
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'