Year	% gross
1971	25.1332302093506
1972	25.6425094604492
1973	28.3534297943115
1974	29.8562297821045
1975	30.4824104309082
1976	32.177619934082
1977	32.2414894104004
1978	31.599889755249
1979	31.3252391815186
1980	31.2373790740967
1981	32.1316909790039
1982	33.0494918823242
1983	33.8967704772949
1984	34.1095085144043
1985	35.4395294189453
1986	35.7929496765137
1987	36.6624298095703
1988	36.9319190979004
1989	36.2955093383789
1990	36.352970123291
2000	51.3820686340332
2001	51.3809814453125
2002	51.6956901550293
2003	55.3156089782715
2004	58.7694091796875
2005	63.3627281188965
2006	61.3850517272949
2007	67.028678894043
2008	67.0525665283203
2009	67.6460876464844
2010	67.7699813842773
2011	64.7837600708008
2012	65.0010299682617
2013	64.4449081420898
2014	67.5489501953125
2015	68.2076034545898
2016	72.6667098999023
2017	72.171257019043
2018	74.0961303710938
2019	76.7972869873047
2021	77.4309997558594