Year	% gross
1972	6.37993001937866
1973	6.39796018600464
1974	7.01841020584106
1975	7.63423013687134
1976	8.23408985137939
1977	8.80035018920898
1978	9.43597030639648
1979	9.97375965118408
1980	10.5634098052979
1981	10.7840204238892
1982	11.0758304595947
1983	11.5587396621704
1984	11.9553804397583
1985	12.349160194397
1986	12.7749700546265
1987	13.2637300491333
1988	13.6338901519775
1989	13.2608098983765
1990	12.9848403930664
1991	12.6771001815796
1992	12.2285995483398
1993	11.7911195755005
1994	11.2393398284912
1995	10.8221797943115
1996	10.5431203842163
1997	10.0190095901489
1998	11.1977701187134
1999	10.8690500259399
2000	11.1812295913696
2001	11.119589805603
2002	11.100640296936
2003	11.208869934082
2004	11.4287996292114
2005	12.1158399581909
2006	12.9849901199341
2007	13.6030502319336
2008	14.7974300384521
2009	15.7796096801758
2010	16.1780796051025
2011	18.27121925354
2012	20.3822994232178
2013	21.7561798095703
2014	22.2407894134521
2015	23.1381206512451
2016	24.6214599609375
2017	25.9251098632813
2018	25.9249801635742
2019	26.5759105682373
2020	27.6436004638672