Year	% gross
1970	28.3406295776367
1971	28.2176399230957
1972	27.8142204284668
1973	27.6185207366943
1974	27.5105800628662
1975	27.7336807250977
1976	28.0521106719971
1977	28.245849609375
1978	28.0135707855225
1979	27.7328395843506
1980	27.5377407073975
1981	27.5716800689697
1982	27.8223094940186
1983	28.2847805023193
1984	28.8464698791504
1985	29.7111396789551
1986	30.0029907226562
1987	29.9579792022705
1988	30.0074100494385
1989	30.0475597381592
1990	30.2233695983887
1991	30.6210708618164
1992	30.1442699432373
1993	29.6186504364014
1994	29.4992294311523
1995	29.5294704437256
1996	30.6823101043701
1997	32.1710510253906
1998	32.7086296081543
1999	34.5398406982422
2000	36.598560333252
2001	39.1956481933594
2002	41.362060546875
2003	44.3992385864258
2004	44.9573211669922
2005	46.7852210998535
2006	48.8104782104492
2007	50.5380783081055
2008	51.6889610290527
2009	53.0111389160156
2010	54.7184295654297
2011	55.8692016601562
2012	57.7240295410156
2013	59.9311599731445
2014	62.2262306213379
2015	63.8907814025879
2016	66.198860168457
2017	68.2326202392578
2018	70.1429824829102
2019	71.2220993041992
2020	72.6346893310547
2021	74.1069183349609
2022	74.371696472168