Year	% gross
1971	14.2488098144531
1972	14.7389497756958
1973	15.9600095748901
1974	16.1713905334473
1975	16.309549331665
1976	16.3923492431641
1977	16.4106597900391
1978	16.3283100128174
1979	15.1938695907593
1980	14.4281797409058
1981	13.9812602996826
1982	14.2727899551392
1983	14.239330291748
1984	14.709059715271
1985	15.7238702774048
1986	17.0328693389893
1987	18.2308197021484
1988	19.3945503234863
1989	22.0102500915527
1990	23.6670207977295
1991	28.8909091949463
1992	27.6483497619629
1993	26.6125602722168
1994	26.9698104858398
1995	27.7539005279541
1996	29.653299331665
1997	31.8652095794678
1998	32.4690589904785
1999	35.199031829834
2000	35.298770904541
2001	34.951961517334
2002	37.0724411010742
2003	39.2500915527344
2004	40.2176513671875
2005	42.8675689697266
2006	43.0832214355469
2007	45.9975318908691
2008	45.5848197937012
2009	47.4323883056641
2010	50.4553298950195
2011	52.1960716247559
2012	54.7837600708008
2013	57.7969398498535
2014	61.8012008666992
2015	65.2734985351562
2016	67.3981781005859
2017	68.1936874389648
2018	68.4603500366211
2019	67.2740783691406
2020	66.5341110229492
2021	65.565559387207