Year	% gross
1971	34.3607711791992
1972	38.5523490905762
1973	43.5417404174805
1974	49.1308898925781
1975	58.4658393859863
1977	66.2043380737305
1978	68.8575973510742
1979	70.545036315918
1980	74.4080810546875
1981	58.293830871582
1982	61.0821113586426
1983	63.5468711853027
1984	65.5278701782227
1985	66.6554336547852
1986	67.0515289306641
1987	90.4050064086914
1988	93.33837890625
1989	95.0188598632813
1990	95.3007125854492
1991	85.7926788330078
1992	85.8402786254883
1993	79.8652191162109
1994	79.3700485229492
1995	82.8628692626953
1996	82.4274978637695
1999	85.3150177001953
2000	85.9094161987305
2001	88.1039962768555
2002	92.5301284790039
2003	93.6248397827148
2004	96.6446228027344
2005	103.661499023438
2006	105.873001098633
2007	105.54833984375
2008	103.494468688965
2009	100.287910461426
2010	102.213241577148
2011	104.934883117676
2012	102.742813110352
2013	103.794403076172
2014	102.249961853027
2015	100.425559997559
2016	97.7658920288086
2017	98.1975173950195
2018	98.8548965454102
2019	98.6317596435547
2020	99.1062774658203
2021	96.7663269042969