Year	% gross
1970	6.49610996246338
1971	6.49778985977173
1972	6.56096982955933
1973	6.69917011260986
1974	6.90640020370483
1975	7.1770601272583
1976	7.47213983535767
1977	7.56453990936279
1978	7.78400993347168
1979	8.22006034851074
1980	8.59609985351562
1981	8.97984027862549
1982	8.88920021057129
1983	8.98029041290283
1984	9.07328033447266
1985	9.06966018676758
1986	9.36886978149414
1987	9.61079978942871
1988	9.33800029754639
1989	9.34922027587891
1990	9.36128044128418
1991	9.32441997528076
1992	9.25728988647461
1993	9.28201007843018
1994	9.71842956542969
1995	10.1406497955322
1996	10.8340797424316
1997	11.4623498916626
1998	12.1242303848267
1999	12.8292903900146
2000	13.5638198852539
2001	14.3762197494507
2002	15.2982702255249
2003	16.4405994415283
2004	17.3061199188232
2005	17.9857501983643
2006	18.9084091186523
2007	19.8507499694824
2008	20.9075107574463
2009	21.8089294433594
2010	23.1376895904541
2011	24.8409194946289
2012	25.840669631958
2013	26.3773193359375
2014	28.8292503356934
2015	29.9733505249023
2016	30.3629398345947
2017	30.6904792785645
2018	30.9589195251465
2019	31.5961303710938
2020	32.6336898803711
2021	33.9786682128906
2022	35.072380065918