Year	% gross
1970	106.851989746094
1971	106.806793212891
1972	106.891616821289
1973	105.463310241699
1974	105.596397399902
1975	105.513221740723
1976	105.580642700195
1977	105.347099304199
1978	105.150718688965
1979	104.753753662109
1980	104.545631408691
1981	104.227447509766
1982	104.27311706543
1983	104.242393493652
1984	104.243202209473
1985	104.571739196777
1986	104.754890441895
1987	104.788131713867
1988	104.425567626953
1989	104.098007202148
1990	103.600082397461
1991	103.293510437012
1992	103.708450317383
1993	104.688858032227
1994	105.42854309082
1995	105.165420532227
1996	105.195281982422
1997	104.222427368164
1998	105.179252624512
1999	104.968841552734
2000	103.659461975098
2001	103.904998779297
2002	103.752281188965
2003	103.61547088623
2004	103.587699890137
2005	104.436309814453
2006	104.303268432617
2007	104.084320068359
2008	103.793937683105
2009	103.216003417969
2010	102.761451721191
2011	102.512237548828
2012	102.23201751709
2013	102.745811462402
2014	102.06022644043
2015	102.027030944824
2016	101.670143127441
2017	102.239181518555
2018	102.371467590332
2019	102.458473205566
2020	102.463401794434
2021	102.033988952637
2022	102.028732299805