Year	% gross
1971	15.6356801986694
1973	15.7832403182983
1979	22.444860458374
1980	23.3184204101562
1981	24.380500793457
1982	24.7553405761719
1992	21.0164203643799
1995	23.4895401000977
1996	24.846549987793
1998	23.7418899536133
1999	25.4751796722412
2001	29.2852001190186
2002	26.9093608856201
2003	26.3219203948975
2004	25.8596305847168
2005	25.704719543457
2006	25.7298908233643
2008	25.9282493591309
2009	25.2506103515625
2010	26.1879997253418
2011	27.5550003051758
2012	28.1299991607666
2013	29.9750003814697
2014	31.6790008544922
2015	33.3810005187988
2016	35.4869995117188
2017	30.8290004730225
2018	25.6060009002686
2019	27.2390003204346
2020	28.871000289917
2021	29.7369995117188