Year	% gross
1971	108.34253692627
1972	109.742813110352
1973	105.831092834473
1974	101.834800720215
1975	98.1342086791992
1976	94.652099609375
1977	91.4519195556641
1978	87.8967208862305
1979	82.8107604980469
1980	95.1133804321289
1981	94.1424789428711
1982	97.4829025268555
1983	96.9823303222656
1984	98.0884628295898
1985	96.8041305541992
1986	96.7650604248047
1987	97.0396270751953
1988	96.7942276000977
1989	96.513427734375
1990	96.299201965332
1991	94.5166320800781
1992	95.556510925293
1993	96.6873168945312
1994	97.0096206665039
1995	94.2719802856445
1996	94.6187896728516
1997	94.0911331176758
1998	93.5667572021484
1999	93.2766265869141
2000	93.5525131225586
2001	93.7950897216797
2002	94.0749816894531
2003	94.3286285400391
2004	94.601806640625
2005	94.8669204711914
2006	95.047248840332
2007	95.3204803466797
2008	95.6057205200195
2009	95.8732681274414
2010	96.0297393798828
2011	96.2605819702148
2012	97.1481018066406
2013	97.3955078125
2014	97.6738510131836
2015	98.4030990600586
2016	100.122039794922
2017	100.271492004395
2018	100.748992919922
2019	101.779403686523
2020	102.30712890625
2021	101.789016723633
2022	101.537536621094