Year	% gross
1970	1.85662996768951
1971	2.08394002914429
1972	2.27618002891541
1973	2.49362993240356
1974	2.74749994277954
1975	3.08307003974915
1976	3.09215998649597
1977	3.09406995773315
1978	3.04001998901367
1979	3.75678992271423
1980	3.61795997619629
1981	4.3487401008606
1982	4.07186985015869
1983	3.97545003890991
1984	3.95061993598938
1985	4.15747022628784
1986	4.10743999481201
1987	4.37841987609863
1988	4.63166999816895
1989	4.87013006210327
1990	6.1477198600769
1991	7.40535020828247
1992	7.51113986968994
1993	7.60172986984253
1994	7.68263006210327
1995	7.77774000167847
1996	7.88089990615845
1997	8.12271976470947
1998	8.25928020477295
1999	8.57771015167236
2000	8.4614896774292
2001	8.53413009643555
2002	8.86065006256104
2003	9.0776195526123
2004	9.10313034057617
2005	9.1124095916748
2006	10.2180299758911
2007	11.2988300323486
2008	12.3439598083496
2009	13.3834896087646
2010	14.3750095367432
2011	15.3529901504517
2012	16.2887802124023
2013	17.183629989624
2014	18.0133800506592
2015	18.7965106964111
2016	19.5553798675537
2017	20.273250579834
2018	21.002649307251
2019	21.5983295440674
2020	21.6412601470947