Year	% gross
1970	13.3775901794434
1971	15.4409799575806
1972	16.6208095550537
1973	19.7516307830811
1974	22.8830108642578
1975	27.0771598815918
1976	27.011739730835
1977	23.9647407531738
1978	21.2509994506836
1979	22.1204700469971
1980	21.7159004211426
1981	23.1923408508301
1982	23.9549007415771
1983	24.9827709197998
1984	28.7928295135498
1985	35.5128898620605
1986	37.5073890686035
1987	39.4006881713867
1991	38.2797012329102
1994	37.1375999450684
1998	47.9915618896484
1999	49.6384315490723
2000	54.3332710266113
2001	58.791690826416
2002	62.0592613220215
2003	64.4024505615234
2004	64.8878479003906
2005	63.732349395752
2006	67.1185913085938
2007	66.9094467163086
2008	68.816291809082
2009	71.0374603271484
2010	74.1875305175781
2011	77.4296112060547
2012	78.4559097290039
2013	78.7686614990234
2014	81.1694107055664
2015	83.762580871582
2016	86.6178817749023
2017	89.2329406738281
2018	90.9728317260742
2019	95.0775527954102
2020	99.266227722168
2021	107.130661010742