Year	% gross
1971	53.1919097900391
1972	50.5817413330078
1973	50.3014297485352
1974	49.4863090515137
1975	48.069450378418
1976	49.6492805480957
1977	53.1087493896484
1978	55.7620887756348
1979	60.6210899353027
1980	64.4220733642578
1981	68.9716110229492
1982	70.2803192138672
1983	68.1095733642578
1984	67.2691268920898
1985	67.1707229614258
1986	68.5452117919922
1987	71.4223327636719
1988	73.4309997558594
1989	74.5341415405273
1990	73.3890609741211
1991	73.2949600219727
1992	74.2602767944336
1997	77.2126922607422
1998	81.5100326538086
1999	84.2992706298828
2000	95.8467407226562
2001	103.552597045898
2002	112.367958068848
2003	121.849151611328
2004	129.702835083008
2005	135.250946044922
2006	144.879516601562
2007	149.449462890625
2008	148.547912597656
2009	148.945083618164
2010	146.46028137207
2011	144.765167236328
2012	142.575485229492
2013	138.536972045898
2014	134.484115600586
2015	133.580352783203
2016	135.249053955078
2017	132.605484008789
2018	129.046142578125
2019	128.136535644531
2021	138.275146484375
2022	134.973190307617