Year	% gross
1991	101.168067932129
1992	101.840812683105
1993	100.170890808105
1994	100.707077026367
1995	100.590446472168
1996	100.832489013672
1997	100.292701721191
1998	102.341766357422
1999	101.972053527832
2000	102.432067871094
2001	104.114189147949
2002	103.757751464844
2003	103.67578125
2004	103.514213562012
2005	102.569808959961
2006	101.719223022461
2007	101.922569274902
2008	102.544357299805
2009	101.942558288574
2010	101.481170654297
2011	100.409332275391
2012	98.8815536499023
2013	98.3399276733398
2014	98.4153823852539
2015	98.2791213989258
2016	97.4668273925781
2017	98.0120391845703
2018	96.85205078125
2019	97.8878021240234
2020	99.7007675170898
2021	100.033538818359
2022	100.442626953125