Year	% gross
1971	0.0665799975395203
1972	0.0720499977469444
1973	0.0600599981844425
1974	0.130280002951622
1975	0.167019993066788
1980	0.191789999604225
1981	0.276699990034103
1982	0.562979996204376
1983	0.723999977111816
1985	0.985509991645813
1986	1.02936995029449
1988	0.985480010509491
1990	0.728739976882935
1993	0.785809993743896
1994	0.71492999792099
1995	0.942239999771118
1996	1.44317996501923
1997	1.54697000980377
1998	1.21209001541138
1999	1.50555002689362
2000	1.81845998764038
2001	2.25641989707947
2002	2.93709993362427
2003	3.48742008209229
2004	4.30205011367798
2005	6.34917020797729
2006	7.16871023178101
2007	9.58578014373779
2008	11.6134004592896
2009	14.6336603164673
2010	14.7435398101807
2011	15.1269998550415
2012	16.0380001068115
2013	18.0480003356934
2014	18.0340003967285
2015	17.8840007781982
2016	17.2259998321533
2017	15.9589996337891
2018	15.2279996871948
2019	14.75
2020	13.6160001754761
2021	13.4010000228882