Year	% gross
1970	6.61239004135132
1971	6.61276006698608
1972	6.67011022567749
1973	6.80182981491089
1974	6.99903011322021
1975	7.26990985870361
1976	7.57823991775513
1977	7.66379976272583
1978	7.88689994812012
1979	8.35317039489746
1980	8.7628698348999
1981	9.15707969665527
1982	9.05070018768311
1983	9.13945007324219
1984	9.22338008880615
1985	9.209059715271
1986	9.52359962463379
1987	9.78557014465332
1988	9.49090003967285
1989	9.50957012176514
1990	9.53324031829834
1991	9.50222015380859
1992	9.45040035247803
1993	9.49824047088623
1994	9.99536037445068
1995	10.4689502716064
1996	11.2369403839111
1997	11.9329700469971
1998	12.6469402313232
1999	13.4077501296997
2000	14.1913204193115
2001	15.0492095947266
2002	16.0420398712158
2003	17.273250579834
2004	18.1925392150879
2005	18.9069499969482
2006	19.8962898254395
2007	20.9119491577148
2008	22.0287990570068
2009	22.9628505706787
2010	24.3938293457031
2011	26.303539276123
2012	27.4292392730713
2013	28.0596904754639
2014	30.8093700408936
2015	32.1640815734863
2016	32.6942291259766
2017	33.1302185058594
2018	33.4923896789551
2019	34.2664184570312
2020	35.4901390075684
2021	37.0829200744629
2022	38.407299041748