Year	% gross
1971	2.05330991744995
1972	1.55127000808716
1977	14.3757295608521
1978	10.9058198928833
1983	19.7736301422119
1984	18.8608894348145
1987	20.3034896850586
1988	21.8190994262695
1990	20.9425392150879
1999	21.691520690918
2001	25.1465396881104
2002	25.5160598754883
2003	23.266170501709
2004	27.8829593658447
2005	27.9043197631836
2007	37.0712585449219
2008	38.1729583740234
2009	40.028190612793
2010	34.9472198486328
2011	47.632999420166
2012	46.8416404724121
2013	42.1878509521484
2014	36.6549186706543
2015	45.0310211181641
2016	48.0906105041504