Year	% gross
1970	2.02852010726929
1971	2.03045988082886
1972	2.08420991897583
1973	2.12127995491028
1974	2.20752000808716
1975	2.27677989006042
1976	2.31640005111694
1977	2.35528993606567
1978	2.46989989280701
1979	2.5307400226593
1980	2.59573006629944
1981	2.63117003440857
1982	2.76401996612549
1983	2.79320001602173
1984	2.91890001296997
1985	3.07202005386353
1986	3.23625993728638
1987	3.38056993484497
1988	3.52221989631653
1989	3.70394992828369
1990	3.78991007804871
1991	3.90724992752075
1992	3.98822999000549
1993	4.2337498664856
1994	4.35967016220093
1995	4.26413011550903
1996	4.18860006332397
1997	4.13832998275757
1998	4.09271001815796
1999	4.12027978897095
2000	4.36265993118286
2001	4.72225999832153
2002	4.9583101272583
2003	5.36021995544434
2004	5.67244005203247
2005	5.93994998931885
2006	6.18823003768921
2007	6.37803983688354
2008	6.89413022994995
2009	7.58927011489868
2010	8.3007698059082
2011	8.81639957427979
2012	8.98239040374756
2013	9.2076301574707
2014	9.33743000030518
2015	9.51253986358643
2016	9.62534046173096
2017	9.68222999572754
2018	9.66629981994629
2019	9.54360961914062
2020	9.93208980560303
2021	9.53339004516602