Year	% gross
1971	14.7935304641724
1972	15.557089805603
1973	17.2538604736328
1974	17.3912105560303
1975	17.8270492553711
1976	19.4059600830078
1977	24.0490894317627
1978	26.3338603973389
1979	28.894100189209
1980	33.3891410827637
1981	34.5427589416504
1982	37.842830657959
1983	38.7469902038574
1984	41.8092613220215
1985	43.1484718322754
1986	46.5476913452148
1987	48.3216285705566
1988	48.9763717651367
1989	47.9897499084473
1990	45.6023712158203
1991	47.8151016235352
1992	52.4599800109863
1993	59.3026695251465
1994	65.4476776123047
1995	69.2773513793945
1996	72.8274536132812
1997	76.6953887939453
1998	78.8770370483398
1999	80.4019393920898
2000	79.7832183837891
2001	78.2036895751953
2002	78.92138671875
2003	80.6755523681641
2004	86.8523483276367
2005	87.048713684082
2006	90.2303009033203
2007	92.4876403808594
2008	89.4860229492188
2009	95.7915115356445
2010	97.2489776611328
2011	95.269889831543
2012	94.8015213012695
2013	93.1958236694336
2014	93.5205764770508
2015	96.381950378418
2016	88.4654083251953
2017	87.7418365478516
2018	90.3253936767578
2019	90.7190322875977
2020	86.6899032592773