Year	% gross
1971	107.52864074707
1972	109.292289733887
1973	110.288116455078
1974	110.726417541504
1975	106.254386901855
1976	106.826591491699
1977	107.555152893066
1978	103.561782836914
1979	98.4373321533203
1980	94.7103424072266
1981	94.8771667480469
1982	96.192756652832
1983	98.5136566162109
1984	102.408950805664
1985	104.428558349609
1986	105.484321594238
1987	104.828216552734
1988	103.509399414063
1989	100.726226806641
1990	98.6895370483398
1991	100.373908996582
1992	103.797546386719
1993	107.129501342773
1994	107.914291381836
1995	109.23966217041
1996	113.586868286133
1997	115.172813415527
2012	103.558486938477
2013	110.479530334473
2014	110.928573608398
2015	102.114151000977
2016	115.999771118164
2017	82.8779067993164
2018	93.4938583374023
2019	97.2625427246094
2020	95.3538970947266