Year	% gross
1971	1.58861994743347
1972	1.52112996578217
1973	1.92147994041443
1974	1.73998999595642
1975	1.93175995349884
1976	1.7460800409317
1977	1.59200000762939
1978	1.06744003295898
1979	1.40306997299194
1980	1.42902004718781
1981	2.58787989616394
1982	2.41651010513306
1983	3.23100996017456
1984	3.36600995063782
1985	2.87477993965149
1986	2.60842990875244
1987	2.444659948349
1991	4.7985200881958
1992	5.28035020828247
1993	4.93684005737305
1994	7.1428599357605
1995	7.48357009887695
1996	8.23703956604004
1997	8.83104038238525
1998	9.38747978210449
1999	10.3409700393677
2000	9.96280002593994
2001	9.9181604385376
2002	11.6310997009277
2003	12.0609903335571
2006	9.85431003570557
2008	10.6716299057007
2010	18.2021293640137
2012	19.117790222168
2015	20.2907104492188
2016	19.9203605651855
2017	19.5990200042725
2018	19.3915195465088
2019	19.3969497680664
2020	19.961389541626
2021	20.7341499328613