Year	% gross
1971	12.0852003097534
1972	12.2323198318481
1976	13.4659595489502
1977	15.1931495666504
1978	15.6112098693848
1981	24.5126705169678
1982	31.9582004547119
1983	38.1827507019043
1984	42.5430908203125
1985	48.1692695617676
1986	53.2514801025391
1987	56.9452705383301
1988	58.7569618225098
1989	59.7481002807617
1990	60.5327186584473
1991	60.8152618408203
1992	61.4173316955566
1993	62.2602310180664
1994	64.0894317626953
1995	66.1119232177734
1996	67.8875885009766
1997	69.5883102416992
1998	71.1980590820313
1999	72.443489074707
2000	73.1223297119141
2001	73.6749801635742
2002	74.2502593994141
2003	79.3395080566406
2004	82.2303771972656
2005	90.7876129150391
2006	99.1014022827148
2007	105.202911376953
2008	104.702850341797
2009	101.66625213623
2010	100.786598205566
2011	101.885810852051
2012	103.483428955078
2013	70.1873092651367
2014	70.912971496582
2015	71.1800231933594
2016	71.2862091064453
2017	72.7426223754883
2018	71.8598480224609
2019	70.0204772949219
2020	69.7396392822266