Year	% gross
1970	67.9403076171875
1971	62.9489898681641
1972	63.3210601806641
1973	68.414192199707
1974	71.315803527832
1975	76.8493194580078
1976	79.8433532714844
1977	84.1769027709961
1978	86.2250137329102
1979	89.7582168579102
1980	94.9077529907227
1981	97.7449798583984
1982	98.8094177246094
1983	100.586288452148
1984	101.854797363281
1985	103.765777587891
1986	104.458297729492
1987	105.136779785156
1988	105.609573364258
1989	106.813179016113
1990	106.05152130127
1991	108.421562194824
1992	106.491607666016
1993	105.330322265625
1994	104.695510864258
1995	103.298919677734
1996	103.947418212891
1997	104.328971862793
1998	103.431610107422
1999	103.297119140625
2000	103.396018981934
2001	104.544471740723
2002	104.762916564941
2003	105.01294708252
2004	104.962112426758
2005	105.352920532227
2006	105.866920471191
2007	104.853553771973
2008	104.299697875977
2009	104.584953308105
2012	101.333702087402
2013	100.564826965332
2014	98.7839736938477
2015	97.9927597045898
2021	93.7229537963867