Year	% gross
1981	53.6375885009766
1982	53.9903793334961
1983	54.0178909301758
1986	60.2517395019531
1987	63.0343818664551
1988	64.3721237182617
1989	60.9702301025391
1990	61.9328689575195
1991	66.0038070678711
1995	71.108642578125
1996	71.6112594604492
2005	71.6500091552734
2013	71.5992813110352
2014	64.1919021606445
2015	72.68505859375
2016	72.0889587402344
2017	72.7267074584961
2018	71.6148834228516
2019	73.0449981689453
2020	72.2323837280273