Year	% gross
1975	5.24686002731323
1976	6.09082984924316
1977	6.22857999801636
1978	6.31580018997192
1979	6.41183996200562
1981	7.0971097946167
1982	10.1839399337769
1986	12.8056497573853
1990	14.0445003509521
1992	12.775899887085
1994	12.8488903045654
1997	12.4980897903442
2004	21.3320007324219
2007	26.5008296966553
2010	28.5629997253418
2011	27.4680004119873
2012	27.431999206543
2013	29.0659999847412
2014	28.806999206543
2016	27.871000289917
2017	25.2810001373291