Year	% gross
1991	21.0225105285645
1992	19.6107692718506
1993	15.7152700424194
1994	14.8639497756958
1995	12.7728595733643
1996	9.94486045837402
1997	8.83257961273193
1998	7.46058988571167
1999	6.76291990280151
2000	6.6774001121521
2001	6.94275999069214
2002	7.79593992233276
2003	8.38387966156006
2004	8.8274097442627
2005	8.72694969177246
2006	8.69680976867676
2007	8.67465019226074
2008	8.41759967803955
2009	8.24730968475342
2010	7.85563993453979
2011	8.22412967681885
2012	8.91586017608643
2013	8.80245971679688
2014	9.31472969055176
2015	9.57907009124756
2016	9.60729026794434
2017	9.18045043945313