Year	% gross
1970	11.678370475769
1971	7.39408016204834
1972	7.99226999282837
1973	10.558629989624
1975	11.7612600326538
1976	12.3481197357178
1977	12.8380498886108
1978	12.9126996994019
1979	15.1384401321411
1980	16.0678997039795
1981	17.4710006713867
1982	17.9796600341797
1983	19.7815895080566
1984	20.4112892150879
1985	20.830940246582
1986	21.3579292297363
1987	22.8472690582275
1988	23.6219100952148
1989	23.6009292602539
1990	23.3977699279785
1991	22.826099395752
1992	24.0338096618652
1993	24.9044704437256
1994	27.132360458374
1995	28.6349506378174
1996	28.5387592315674
1997	29.7048397064209
1998	29.330680847168
1999	29.5656700134277
2000	29.6085395812988
2001	31.3147201538086
2002	32.3517684936523
2003	33.1711616516113
2004	35.5687103271484
2005	37.7083511352539
2006	38.8591384887695
2007	41.725658416748
2008	44.7003593444824
2009	48.7411193847656
2010	53.4280281066895
2011	55.9379386901855
2012	57.9205207824707
2013	56.5283889770508
2014	57.1081886291504
2015	58.589469909668
2016	56.669620513916
2017	59.820140838623