Year	% gross
1970	31.3707599639893
1971	31.2811908721924
1972	30.9099903106689
1973	30.6659107208252
1974	30.469259262085
1975	30.578369140625
1976	30.7639102935791
1977	30.7681503295898
1978	30.3292102813721
1979	29.8107490539551
1980	29.4750308990479
1981	29.4035396575928
1982	29.728759765625
1983	30.3487491607666
1984	31.0415191650391
1985	32.0758018493652
1986	32.4107398986816
1987	32.5532684326172
1988	32.7383308410645
1989	32.7392692565918
1990	33.0812110900879
1991	33.3257713317871
1992	32.588508605957
1993	31.5476493835449
1994	31.0975799560547
1995	30.8977298736572
1996	31.763599395752
1997	33.0999794006348
1998	33.6089706420898
1999	35.0839385986328
2000	37.049560546875
2001	39.3362007141113
2002	41.2281303405762
2003	44.3446617126465
2004	44.7351989746094
2005	46.4847183227539
2006	48.3728294372559
2007	49.9915504455566
2008	50.6181297302246
2009	51.7590217590332
2010	53.8215484619141
2011	55.5493316650391
2012	58.0469284057617
2013	60.770450592041
2014	63.5502281188965
2015	65.3587493896484
2016	68.097297668457
2017	70.2946166992188
2018	72.4056091308594
2019	73.6470184326172
2020	74.9755783081055
2021	76.7292098999023
2022	76.8777084350586