Year	% gross
1971	14.4272003173828
1972	15.0686902999878
1977	26.202600479126
1988	37.6565818786621
2003	32.9246597290039
2004	38.461540222168
2005	41.1574897766113
2007	44.432071685791
2008	41.7871513366699
2009	46.1217613220215
2010	49.368579864502
2011	45.2772216796875
2012	52.7177810668945
2013	60.3419990539551
2014	71.4537506103516
2015	79.2987213134766
2016	79.9620971679688
2017	85.7021713256836