Year	% gross
1970	53.5209007263184
1971	54.2075004577637
1972	55.432430267334
1973	56.7359886169434
1974	58.9616203308105
1975	60.6001014709473
1976	61.7557601928711
1977	65.1166229248047
1978	68.8824691772461
1979	73.3352508544922
1980	76.3971710205078
1981	78.9531097412109
1982	81.0298004150391
1983	81.0493927001953
1984	80.2537231445312
1985	77.8787536621094
1986	75.2318420410156
1987	73.4290084838867
1988	72.2005081176758
1989	72.6637878417969
1990	71.6524124145508
1991	72.5257797241211
1992	72.3256912231445
1993	73.2940673828125
1994	73.4469909667969
1995	74.0486297607422
1996	72.2267608642578
1997	76.1017227172852
1998	77.3666610717773
1999	77.8753509521484
2000	80.2620010375977
2001	82.2901611328125
2002	84.6880111694336
2003	87.4682922363281
2004	89.6904907226562
2005	92.2598266601562
2006	94.1709899902344
2007	95.1420822143555
2008	96.4962310791016
2009	96.9056701660156
2010	96.7092666625977
2011	97.9872589111328
2012	98.6880187988281
2013	98.8279571533203
2014	97.9637908935547
2015	96.974967956543
2016	96.7461395263672
2017	97.276123046875
2018	97.9806976318359
2019	98.874137878418
2020	99.6195983886719
2021	98.8163986206055
2022	98.8512268066406