Year	% gross
1971	85.9721069335938
1972	89.7201614379883
1973	95.8324966430664
1974	97.648323059082
1975	103.602249145508
1976	103.433532714844
1977	104.60075378418
1978	103.718551635742
1979	101.555206298828
1980	100.127380371094
1981	101.009803771973
1982	104.079856872559
1983	109.616012573242
1984	115.706619262695
1985	118.397300720215
1986	119.663177490234
1987	115.324203491211
1988	110.446296691895
1989	106.370941162109
1990	107.961921691895
1991	109.051200866699
1992	109.940559387207
1993	111.125762939453
1994	113.146362304688
1995	113.163948059082
1996	112.85733795166
1997	111.669700622559
1998	110.539772033691
1999	109.009262084961
2000	108.326110839844
2001	108.281219482422
2002	107.659736633301
2003	107.354248046875
2004	106.19669342041
2005	110.179679870605
2006	109.862953186035
2007	109.550140380859
2008	108.838859558105
2009	107.852836608887
2010	106.221321105957
2011	105.898712158203
2012	105.190582275391
2013	104.776229858398
2014	104.21662902832
2015	105.15397644043
2016	105.32527923584
2017	105.899238586426
2018	106.073150634766
2019	106.681671142578
2020	107.280250549316