Year	% gross
1971	0.128429993987083
1972	0.234990000724792
1973	0.424690008163452
1974	0.681900024414062
1975	0.659449994564056
1976	0.713479995727539
1977	0.944249987602234
1978	1.0393899679184
1979	0.919040024280548
1980	0.996079981327057
1981	1.36494994163513
1982	1.61880004405975
1983	1.74844002723694
1984	1.80426001548767
1985	1.86591994762421
1986	2.24176001548767
1987	2.12834000587463
1988	2.06945991516113
1989	2.20922994613647
1990	2.02301001548767
1991	2.32081007957458
1992	2.19625997543335
1993	2.00092005729675
1994	1.95361995697021
1995	2.0343599319458
1996	2.05464005470276
1997	2.51360011100769
1999	3.20745992660522
2000	3.62698006629944
2001	4.36625003814697
2002	5.1319899559021
2003	5.66462993621826
2004	5.71906995773315
2005	5.65152978897095
2006	6.47643995285034
2007	7.7589898109436
2008	7.66394996643066
2009	9.74950981140137
2010	13.1351699829102
2011	12.2822198867798
2012	13.3533802032471
2013	15.3102397918701
2014	15.196590423584
2015	12.9073896408081
2016	12.3617095947266
2017	11.7388401031494
2018	12.0070600509644
2019	10.7973299026489
2020	10.8024797439575
2021	10.2315101623535