Year	% gross
1999	5.78015995025635
2000	5.53382015228271
2001	6.98707008361816
2002	7.73811006546021
2003	7.26901006698608
2004	8.933030128479
2005	10.1038103103638
2006	11.1648197174072
2007	10.9805297851562
2008	12.8201704025269
2009	13.0528697967529
2010	13.3276596069336
2011	14.2222700119019
2012	14.3571500778198
2013	16.6194896697998
2014	16.6031093597412
2015	17.1142902374268