Year	Percent
1980	230.31874
1981	244.27456
1982	203.05865
1983	175.12219
1984	171.13953
1985	164.40929
1986	150.86521
1987	151.65
1988	135.15581
1989	154.39113
1990	176.67555
1991	165.2433
1992	162.65831
1993	145.83869
1994	132.24839
1995	133.82414
1996	147.05349
1997	132.45758
1998	110.54733
1999	121.74879
2000	119.47601
2001	110.10218
2002	112.19711
2003	110.96187
2004	113.62995
2005	122.95954
2006	122.75112
2007	115.60976
2008	125.6122
2009	95.79493
2010	105.90349
2011	112.52281
2012	106.01242
2013	111.4951
2014	100.27654
2015	87.19691
2016	68.27907
2017	79.19081