Year	% gross
1970	53.7922592163086
1971	53.7174110412598
1972	54.4897918701172
1973	54.7819709777832
1974	53.992618560791
1975	61.2836112976074
1976	63.9911918640137
1977	64.6189270019531
1978	65.9672164916992
1979	67.2521514892578
1980	70.4644012451172
1981	67.9532699584961
1982	67.9829330444336
1983	68.40087890625
1984	68.3170623779297
1985	70.1645126342773
1986	72.0123596191406
1987	71.7176818847656
1988	73.3611679077148
1989	73.1608810424805
1990	73.6511306762695
1991	74.3457336425781
1992	73.9663162231445
1993	72.4753723144531
1994	73.998649597168
1995	75.5865173339844
1996	77.2840881347656
1997	78.952392578125
1998	80.3865585327148
1999	81.4812622070312
2000	82.5890121459961
2001	83.6573333740234
2002	84.3272476196289
2003	83.9681930541992
2004	86.101318359375
2005	86.3214111328125
2006	87.6167831420898
2007	88.8505706787109
2008	89.8929214477539
2009	90.1965637207031
2010	91.9290008544922
2011	93.1635437011719
2012	92.2510299682617
2013	90.8945388793945
2014	91.2458419799805
2015	90.2575836181641
2016	92.3246307373047
2017	91.4511337280273
2018	90.381950378418
2019	91.1886825561523
2020	90.2304916381836
2021	88.6597290039062
2022	88.844367980957