Year	% gross
1971	0.934970021247864
1972	1.03518998622894
1973	1.1674200296402
1974	1.36216998100281
1975	1.47032999992371
1976	1.67648005485535
1977	2.04045009613037
1978	2.44512009620667
1979	2.90558004379272
1980	3.403559923172
1981	3.94903993606567
1982	4.44745016098022
1983	4.37894010543823
1984	4.48175001144409
1988	5.04234981536865
1989	5.51190996170044
1990	5.54964017868042
1991	6.03282022476196
1992	5.83910989761353
1993	5.85685014724731
1996	6.07421016693115
1997	6.20143985748291
1998	6.08886003494263
1999	6.26581001281738
2000	6.17179012298584
2001	6.11352014541626
2002	6.1763801574707
2003	6.76632022857666
2004	8.24114990234375
2005	9.15985012054443
2006	10.5753402709961
2007	10.2083396911621
2008	10.5689897537231
2009	11.1008996963501
2010	12.6883201599121
2011	13.5426797866821
2012	14.6892900466919
2013	16.8310508728027
2014	18.8901805877686
2015	20.897970199585
2016	24.1179599761963
2017	25.3490695953369