Year	% gross
1970	72.9165802001953
1971	72.8619918823242
1972	74.5674285888672
1973	77.3156280517578
1974	77.7502288818359
1975	79.073860168457
1976	79.5201187133789
1977	81.8299407958984
1978	81.298713684082
1979	82.0483474731445
1980	83.7635726928711
1981	85.0454483032227
1982	86.4936065673828
1983	87.7649230957031
1984	88.3663482666016
1985	87.4458236694336
1986	87.4787368774414
1987	86.3693008422852
1988	87.4383392333984
1989	88.6017608642578
1990	88.3851699829102
1991	88.6930236816406
1992	89.1979522705078
1993	90.5495071411133
1994	91.4505081176758
1995	90.7563400268555
1996	90.4532165527344
1997	90.9472274780273
1998	90.7618789672852
1999	91.3608093261719
2000	92.7839202880859
2001	92.6569671630859
2002	93.4997482299805
2003	97.5072174072266
2004	99.1067199707031
2005	100.412010192871
2006	101.058601379395
2007	101.625602722168
2008	101.049537658691
2009	100.659103393555
2010	100.780891418457
2011	100.746017456055
2012	101.881790161133
2013	102.808120727539
2014	101.648330688477
2015	101.783111572266
2016	104.206741333008
2017	103.461151123047
2018	97.6024017333984
2019	97.5006637573242
2020	98.3837738037109
2021	98.8155212402344
2022	101.678001403809