Year	% gross
1970	85.7745208740234
1971	84.4968414306641
1972	86.2555236816406
1973	88.9321365356445
1974	91.86083984375
1975	93.8717193603516
1976	95.1352233886719
1977	95.5325393676758
1978	95.9451522827148
1979	95.4333801269531
1980	96.271240234375
1981	97.4067993164062
1982	97.5139694213867
1983	97.5854034423828
1984	97.6905517578125
1985	98.4028625488281
1986	97.7766036987305
1987	98.798698425293
1988	98.5719909667969
1989	97.8715972900391
1990	95.9058609008789
1991	95.979248046875
1992	95.0008392333984
1993	94.5670471191406
1994	95.3163986206055
1995	95.7478866577148
1996	95.5339965820312
1997	95.4224090576172
1998	96.2204284667969
1999	95.9597778320312
2000	98.175178527832
2001	99.5085220336914
2002	100.073623657227
2003	101.15234375
2004	101.73412322998
2005	102.223320007324
2006	103.508773803711
2007	103.195487976074
2008	103.896331787109
2009	103.814170837402
2010	103.94947052002
2011	103.383377075195
2012	103.536163330078
2013	103.188758850098
2014	102.763748168945
2015	102.507720947266
2016	102.263656616211
2017	102.306022644043
2018	102.366470336914
2019	102.724571228027
2020	102.939636230469
2021	102.530708312988
2022	102.864959716797