Year	% gross
1970	58.541919708252
1971	58.9859580993652
1972	59.6404495239258
1973	61.0997695922852
1974	63.5072288513184
1975	64.6765594482422
1976	66.2392425537109
1977	67.2070999145508
1978	67.9732971191406
1979	68.7738494873047
1980	69.939826965332
1981	70.7934799194336
1982	70.9220428466797
1983	71.294059753418
1984	71.9267120361328
1985	72.4730072021484
1986	73.2770233154297
1987	73.7207870483398
1988	73.9357833862305
1989	74.268440246582
1990	75.0451812744141
1991	75.1187286376953
1992	75.0018081665039
1993	75.2913665771484
1994	75.9251480102539
1995	76.3183517456055
1996	78.2799911499023
1997	80.1038513183594
1998	81.3636932373047
1999	82.860237121582
2000	84.0234527587891
2001	84.9972915649414
2002	86.1800918579102
2003	87.2387924194336
2004	86.7903213500977
2005	89.5360717773438
2006	90.2789611816406
2007	90.7568664550781
2008	91.5357666015625
2009	91.8392791748047
2010	92.8956832885742
2011	93.6756820678711
2012	93.9606628417969
2013	94.0208435058594
2014	94.5279388427734
2015	95.7346115112305
2016	96.9761505126953
2017	96.5391006469727
2018	97.9506378173828
2019	99.4109802246094
2020	100.305686950684