Year	% gross
1970	51.0638885498047
1971	51.1848411560059
1972	51.5268592834473
1973	52.4997711181641
1974	53.3574600219727
1975	54.6078186035156
1976	56.3605308532715
1977	58.2944107055664
1978	58.7368583679199
1979	59.7508316040039
1980	61.6392288208008
1981	63.1781806945801
1982	62.5556411743164
1983	62.4160804748535
1984	62.6022682189941
1985	61.839729309082
1986	61.9390907287598
1987	60.9664192199707
1988	61.4403610229492
1989	60.0012702941895
1990	58.3456611633301
1991	60.1318283081055
1992	58.773078918457
1993	58.8143196105957
1994	59.8819694519043
1995	62.6272888183594
1996	62.8090896606445
1997	67.4550704956055
1998	68.3118133544922
1999	67.6834411621094
2000	70.0591201782227
2001	73.1694183349609
2002	78.1941604614258
2003	81.6740570068359
2004	84.4005279541016
2005	87.4584579467773
2006	90.3259124755859
2007	92.7819595336914
2008	97.1316375732422
2009	97.8363876342773
2010	97.6242523193359
2011	97.7007675170898
2012	98.6358413696289
2013	98.2332229614258
2014	98.1883087158203
2015	97.1570205688477
2016	98.0926132202148
2017	98.7732009887695
2018	99.7860412597656
2019	100.799430847168
2020	101.720352172852
2021	100.603057861328
2022	100.617980957031