Year	% gross
1970	0.621070027351379
1971	0.622600018978119
1972	0.665459990501404
1973	0.728039979934692
1974	0.789539992809296
1975	0.833299994468689
1976	0.929059982299805
1977	1.0869699716568
1978	1.22565996646881
1979	1.49164998531342
1980	1.64664995670319
1981	1.918869972229
1982	2.05201005935669
1983	2.14720988273621
1984	2.2175600528717
1985	2.41463994979858
1986	2.55904006958008
1987	2.53029990196228
1988	2.7177300453186
1989	2.84406995773315
1990	2.951819896698
1991	3.05571007728577
1992	3.1943199634552
1993	3.37288999557495
1994	3.53220009803772
1995	3.67533993721008
1996	3.86939001083374
1997	4.09748983383179
1998	4.25322008132935
1999	4.42211008071899
2000	5.04572010040283
2001	5.5334300994873
2002	6.0457501411438
2003	6.54757976531982
2004	6.74177980422974
2005	7.17052984237671
2006	7.23658990859985
2007	7.47082996368408
2008	7.730299949646
2009	7.87613010406494
2010	8.161789894104
2011	8.46137046813965
2012	8.84718990325928
2013	9.38062953948975
2014	9.63352012634277
2015	9.67858028411865
2016	9.47387027740479
2017	9.5884895324707
2018	9.77540969848633
2019	9.8895902633667
2020	10.0590896606445