Year	% gross
1971	86.132682800293
1972	87.3711700439453
1974	87.1072006225586
1975	87.0954513549805
1976	87.3808517456055
1977	87.8748931884766
1978	88.0493011474609
1979	82.3985214233398
1980	96.3816680908203
1981	95.3457717895508
1982	98.4853973388672
1983	97.4934997558594
1984	98.1367263793945
1985	96.3455810546875
1986	96.922737121582
1987	97.3238983154297
1990	96.0541305541992
1991	94.9064025878906
1993	96.2623825073242
1994	96.1809234619141
1995	94.2294387817383
1996	93.9519882202148
1998	94.4901962280273
1999	94.419189453125
2005	95.0524826049805
2013	96.1864929199219
2014	96.9245376586914
2015	97.6525497436523
2016	98.7699279785156
2017	98.9523391723633
2018	99.2755813598633
2019	100.063430786133
2020	100.509819030762
2021	101.192489624023
2022	97.4734878540039