Year	% gross
1970	2.58576011657715
1971	2.56427001953125
1972	2.58933997154236
1973	2.6875
1974	2.84784007072449
1975	2.97699999809265
1976	3.03112006187439
1977	3.07836008071899
1978	3.13498997688293
1979	3.10008001327515
1980	3.09740996360779
1981	3.19091010093689
1982	3.28289008140564
1983	3.3047399520874
1984	3.39141988754272
1985	3.44678997993469
1986	3.51242995262146
1987	3.51618003845215
1988	3.54730010032654
1989	3.49365997314453
1990	3.49340009689331
1991	3.41927003860474
1992	3.30648994445801
1993	3.22073006629944
1994	3.04176998138428
1995	2.92925000190735
1996	2.86063003540039
1997	2.81191992759705
1998	2.84253001213074
1999	2.92720007896423
2000	3.13062000274658
2001	3.2989399433136
2002	3.51320004463196
2003	3.56957006454468
2004	3.86137008666992
2005	4.19116020202637
2006	4.58934020996094
2007	4.71914005279541
2008	5.04941987991333
2009	5.49582004547119
2010	5.90059995651245
2011	6.11475992202759
2012	6.53881978988647
2013	6.63653993606567
2014	6.9614200592041
2015	6.97973012924194
2016	6.89796018600464
2017	7.00658988952637
2018	7.09975004196167
2019	7.28677988052368
2020	7.4988899230957