Year	% gross
1970	2.15937995910645
1971	2.20812010765076
1972	2.26472997665405
1973	2.28467011451721
1974	2.34505009651184
1975	2.35595011711121
1976	2.37892007827759
1977	2.54562997817993
1978	2.63510990142822
1979	2.93285989761353
1980	3.02747011184692
1981	3.17569994926453
1982	3.34144997596741
1983	3.49302005767822
1984	3.60306000709534
1985	3.68261003494263
1986	3.73310995101929
1987	3.74804997444153
1988	3.76928997039795
1989	3.77434992790222
1990	3.85274004936218
1991	3.8485701084137
1992	3.79401993751526
1993	3.89088988304138
1994	3.8901801109314
1995	3.93383002281189
1996	4.03436994552612
1997	4.12910985946655
1998	4.26216983795166
1999	4.42920017242432
2000	4.73905992507935
2001	5.16833019256592
2002	5.37526988983154
2003	5.57274007797241
2004	5.80232000350952
2005	6.26473999023438
2006	6.60033988952637
2007	6.97133016586304
2008	7.39965009689331
2009	8.08847045898438
2010	8.72684955596924
2011	9.17022037506104
2012	9.61073017120361
2013	9.97177028656006
2014	10.2298202514648
2015	10.4588899612427
2016	10.5462398529053
2017	10.7166795730591
2018	10.9814596176147
2019	11.8069400787354
2020	12.0356903076172
2021	12.1953296661377
2022	12.320369720459