Year	Percent
1970	37.9856
1971	44.22523
1972	51.18602
1979	76.23502
1981	89.98251
1982	92.87033
1983	83.8784
1984	83.6515
1985	90.22666
1986	99.39171
1987	101.13512
1988	96.64846
1989	95.45856
1990	96.76157
1991	96.64649
1992	96.37004
1993	94.81726
1994	99.9065
1995	94.64186
1996	96.67333
1998	97.0697
1999	96.166
2000	96.18527
2001	99.32743
2002	99.53874
2003	99.49798
2004	99.03513
2005	100.23382
2006	103.0524
2007	98.10272
2008	98.64549
2009	98.69397
2012	102.29691
2013	103.29485
2014	75.77731