Year	% gross
1970	102.650672912598
1971	103.930877685547
1972	93.949333190918
1973	91.3989715576172
1974	86.0237121582031
1975	83.1410064697266
1976	82.7679061889648
1977	87.7064971923828
1978	110.989212036133
1979	114.628036499023
1980	119.281517028809
1981	122.501319885254
1982	122.830039978027
1983	122.421852111816
1984	122.966499328613
1985	123.736709594727
1986	123.63842010498
1987	106.744743347168
1988	107.043449401855
1989	107.912490844727
1990	108.770622253418
1991	110.847297668457
1992	110.409599304199
1993	111.021682739258
1994	110.460067749023
1995	112.443450927734
1996	106.883110046387
1998	105.266380310059
2001	104.364463806152
2002	102.992111206055
2003	100.474731445312
2004	96.0155410766602
2005	98.1022415161133
2006	97.6338500976562
2007	96.774772644043
2008	95.7359237670898
2009	93.3820571899414
2010	97.7819976806641
2011	97.4040374755859
2012	97.1795196533203
2013	97.2749786376953
2014	97.4337005615234
2015	97.5291137695312
2016	97.9382476806641
2017	97.6488418579102
2018	97.2796020507812
2019	97.2772064208984
2020	97.4786605834961
2021	96.8720016479492