Year	% gross
1971	99.3432769775391
1972	101.325126647949
1973	102.260177612305
1974	102.445648193359
1975	102.230667114258
1976	102.619842529297
1977	100.481742858887
1978	99.5130310058594
1979	100.225540161133
1980	100.591102600098
1981	101.765693664551
1982	102.908462524414
1983	103.708251953125
1984	103.184036254883
1985	102.409317016602
1986	100.286727905273
1987	99.0431289672852
1988	97.151237487793
1989	96.8412628173828
1990	98.177131652832
1991	98.811653137207
1992	100.705253601074
1993	101.630561828613
1994	102.921119689941
1995	102.995323181152
1996	102.314636230469
1997	99.7944183349609
1998	100.286567687988
1999	100.777702331543
2000	99.5272598266602
2001	99.0983963012695
2002	99.2899703979492
2003	100.208549499512
2004	100.302947998047
2005	100.465278625488
2006	100.482131958008
2007	100.805862426758
2008	101.342163085938
2009	101.012229919434
2010	100.681167602539
2011	100.748390197754
2012	100.85961151123
2013	99.9917068481445
2014	99.1683502197266
2015	99.9113235473633
2016	99.6106109619141
2017	98.4870529174805
2018	98.5674133300781
2019	99.5402526855469
2020	99.1011962890625
2021	98.5342330932617
2022	98.8864135742188