Year	% gross
1970	54.5770988464355
1971	54.4518089294434
1972	56.889949798584
1973	58.5765914916992
1974	59.4084281921387
1975	62.156909942627
1976	64.5601577758789
1977	66.4307174682617
1978	67.7970886230469
1979	68.6220474243164
1980	71.7490997314453
1981	71.902717590332
1982	73.8681564331055
1983	75.3318634033203
1984	77.1107635498047
1985	77.7165298461914
1986	79.1003189086914
1987	80.3441772460938
1988	81.2538070678711
1989	81.8562698364258
1990	83.5886383056641
1991	84.6385803222656
1992	83.1148834228516
1993	83.613899230957
1994	85.4207229614258
1995	84.5921020507812
1996	84.9673080444336
1997	86.6742782592773
1998	87.6411514282227
1999	88.6148071289062
2000	89.2592697143555
2001	90.4099273681641
2002	91.8219375610352
2003	93.2509994506836
2004	94.2777709960938
2005	94.7076568603516
2006	95.5539703369141
2007	96.1363906860352
2008	96.2740707397461
2009	96.4996795654297
2010	96.9772567749023
2011	96.4525985717773
2012	98.3801727294922
2013	99.2788009643555
2014	97.1622467041016
2015	96.5538101196289
2016	95.7283935546875
2017	95.5231475830078
2018	95.6761932373047
2019	96.080207824707
2020	96.4629898071289
2021	96.5403366088867
2022	95.5038909912109