Year	% gross
1970	7.04989004135132
1971	5.47444009780884
1972	5.49455976486206
1973	5.36910009384155
1974	5.31124019622803
1975	6.46515989303589
1976	6.3092999458313
1977	6.29577016830444
1978	5.23266983032227
1979	5.13255977630615
1980	5.07340002059937
1981	5.16971015930176
1982	5.3111400604248
1983	5.37799978256226
1984	5.47508001327515
1985	5.45264005661011
1986	5.39600992202759
1987	5.32665014266968
1988	5.45611000061035
1989	5.56556987762451
1990	5.85130977630615
1991	5.91223001480103
1992	6.06070995330811
1993	6.39888000488281
1994	6.57141017913818
1995	6.6602201461792
1996	7.47419023513794
1997	7.64170980453491
1998	7.92791986465454
1999	7.89425992965698
2000	8.39624977111816
2001	8.93190956115723
2002	8.94344043731689
2003	9.81402969360352
2004	10.2872200012207
2005	10.4981603622437
2006	10.7773704528809
2007	11.3785800933838
2008	12.4409303665161
2009	14.0215396881104
2010	14.3778600692749
2011	15.25119972229
2012	15.4568796157837
2013	15.8645296096802
2014	16.0048408508301
2015	15.8183298110962
2016	15.580189704895
2017	15.7218999862671
2018	15.8872900009155
2019	16.5947093963623
2020	16.9075908660889
2021	17.5362300872803