Year	% gross
1971	13.0258302688599
1972	14.4915399551392
1976	27.5639305114746
1977	25.4401702880859
1981	21.8361892700195
1982	27.9557590484619
1983	35.9616584777832
1984	37.5326690673828
1987	29.3640995025635
1988	35.5874214172363
2003	36.1007194519043
2004	39.6485404968262
2005	42.9937782287598
2007	46.472110748291
2008	43.5881690979004
2009	49.1410713195801
2010	50.1739196777344
2011	48.7168998718262
2012	56.1721000671387
2013	63.2053604125977
2014	74.2047805786133
2015	82.3763809204102
2016	83.8670120239258
2017	90.3803787231445