Year	% gross
1971	2.24832010269165
1972	1.91847002506256
1977	13.6607904434204
1978	10.9078903198242
1980	12.3650302886963
1981	19.0140800476074
1982	19.5882396697998
1983	19.5433902740479
1984	19.4624805450439
1985	19.3831806182861
1987	20.5167198181152
1988	21.9012508392334
1990	21.4503593444824
1999	22.948600769043
2001	26.208080291748
2002	27.0518798828125
2003	24.5580596923828
2004	28.1570205688477
2005	28.44407081604
2007	38.3126792907715
2008	39.2303886413574
2009	41.6760597229004
2010	36.5633087158203
2011	48.9014091491699
2012	47.8358612060547
2013	44.0279312133789
2014	39.0147514343262
2015	47.3727607727051
2016	50.308048248291