Year	% gross
1971	97.1539535522461
1972	96.4691009521484
1973	95.1397323608398
1974	95.2038421630859
1975	98.166259765625
1976	97.0479736328125
1977	96.0099792480469
1978	94.2675170898438
1979	96.405647277832
1980	96.6974868774414
1981	98.3892593383789
1982	97.1774215698242
1983	100.272476196289
1984	98.75
1985	98.4572219848633
1986	98.7142868041992
1987	101.075271606445
1988	101.284111022949
1989	103.030296325684
1990	101.5625
1991	98.4293212890625
1992	98.9743576049805
1993	99.6527786254883
1994	101.433692932129
1996	95.7522125244141
1997	96.5576629638672
2000	90.9090881347656
2008	93.851936340332
2009	92.3267288208008
2010	98.3890991210938
2011	95.2258071899414
2012	97.2899703979492
2013	88.6039962768555
2014	90.6060028076172
2015	95.9209976196289
2018	99.7674407958984
2019	101.23609161377
2020	95.0494995117188
2021	96.9426803588867
2022	99.0691528320312