Year	% gross
1971	0.0278299991041422
1975	0.0770599991083145
1976	0.101740002632141
1977	0.126709997653961
1978	0.165189996361732
1979	0.181189998984337
1980	0.191249996423721
1982	0.152050003409386
1983	0.213239997625351
1985	0.280380010604858
1986	0.249249994754791
1987	0.20456999540329
1989	0.16915999352932
1990	0.166600003838539
1991	0.167229995131493
1992	0.2153500020504
1993	0.272830009460449
1995	0.276800006628036
1996	0.351539999246597
1997	0.560259997844696
1998	0.566799998283386
1999	1.15989995002747
2000	1.19614994525909
2001	1.31149995326996
2002	1.30701005458832
2008	3.10490989685059
2009	3.19713997840881
2010	3.30535006523132
2011	3.04329991340637
2012	3.72630000114441
2013	3.60482001304626
2014	3.367919921875
2015	3.12724995613098
2016	2.15799999237061
2017	2.50500011444092
2018	3.18499994277954
2019	3.17400002479553