Year	% gross
1999	6.36923980712891
2000	6.41495990753174
2001	7.83400011062622
2002	8.77309989929199
2003	8.12551021575928
2004	9.83870983123779
2005	11.0538301467896
2006	12.4847202301025
2007	12.2144804000854
2008	13.5937595367432
2009	14.0590200424194
2010	14.5465803146362
2011	14.5883703231812
2012	15.2577896118164
2013	17.5413608551025
2014	17.0886402130127
2015	17.2059803009033