Year	% gross
1975	0.741959989070892
1976	0.820490002632141
1977	1.04621005058289
1978	1.17818999290466
1979	1.6331000328064
1980	1.87249994277954
1981	2.3659200668335
1982	2.71085000038147
1983	2.88813996315002
1984	3.04239988327026
1985	3.42952990531921
1986	3.59347009658813
1987	3.51985001564026
1988	3.89439988136292
1989	4.16656017303467
1999	5.98657989501953
2003	9.57164001464844
2004	9.82485008239746
2005	10.43577003479
2010	9.60007953643799
2011	10.1537199020386
2017	11.5790004730225
2018	11.8109998703003