Year	Percent
1970	86.52174
1971	98.58357
1972	108.8033
1974	107.59331
1975	107.57576
1976	107.83818
1977	106.41509
1978	110.58531
1980	100.36765
1981	93.93564
1982	92.76808
1983	101.12782
1984	98.10845
1985	97.96438
1986	108.05627
1987	105.47074
1988	89.61202
1989	91.93154
1991	104.23216
1992	94.2402
1993	96.39752
1994	91.68766
1997	99.87294
1998	102.80971
1999	102.43902
2000	100.64267
2001	106.00522
2002	107.14286
2003	107.6
2004	104.04858
2005	115.04178
2007	112.46334
2008	112.63158
2009	106.61538
2010	108.58034
2011	115.50889
2012	108.11258
2013	108.75421
2014	116.12903
2015	121.489
2016	123.56792