Year	% gross
1981	100.286979675293
1986	106.732398986816
1989	99.5996704101562
1990	97.9775009155273
1991	95.7788772583008
1992	94.2460632324219
1993	92.1649322509766
1994	90.4385528564453
1997	89.8323135375977
1998	88.4654922485352
1999	91.8715896606445
2000	91.1415710449219
2006	99.4384231567383
2010	100.631416320801
2011	100.990997314453
2012	101.363998413086
2013	100.429847717285
2014	101.920097351074
2015	102.357933044434
2016	102.222221374512
2017	102.229789733887
2018	102.058311462402
2019	101.415771484375
2020	94.4198989868164