Year	% gross
1970	71.6526794433594
1971	71.6411819458008
1972	74.256721496582
1973	75.8210983276367
1974	76.4834594726562
1975	79.1364669799805
1976	81.1563491821289
1977	82.2803268432617
1978	82.9984893798828
1979	82.1288909912109
1980	84.8260879516602
1981	84.0570983886719
1982	85.7231903076172
1983	86.777946472168
1984	87.970100402832
1985	87.9049072265625
1986	88.7571182250977
1987	89.7017211914062
1988	90.6362686157227
1989	90.547233581543
1990	91.9339599609375
1991	92.9013137817383
1992	90.5880966186523
1993	90.7762985229492
1994	92.6210098266602
1995	91.2321014404297
1996	93.0771026611328
1997	93.3346176147461
1998	93.9342880249023
1999	94.5098266601562
2000	94.7486724853516
2001	95.4669723510742
2002	96.53125
2003	97.651237487793
2004	98.4166870117188
2005	98.6584396362305
2006	99.3622589111328
2007	99.6198577880859
2008	99.5140609741211
2009	99.6859436035156
2010	100.041618347168
2011	99.7425231933594
2012	101.195709228516
2013	101.768600463867
2014	99.2816314697266
2015	98.3097076416016
2016	97.4324264526367
2017	97.1762390136719
2018	97.2708206176758
2019	97.5645980834961
2020	97.8318634033203
2021	97.8748321533203
2022	96.7716827392578