Year	Percent
1970	95.16324
1971	95.58999
1972	96.00939
1973	96.30058
1974	96.69704
1975	96.9697
1976	97.34513
1977	97.70742
1978	98.06243
1979	98.30149
1980	98.53403
1981	98.96587
1982	99.18367
1983	99.49597
1984	99.70149
1985	100.09833
1986	100.29126
1987	100.47985
1988	100.75901
1989	100.93721
1990	101.11214
1991	101.37615
1992	101.54265
1993	101.70557
1994	101.86667
1995	102.02465
1996	102.26284
1997	102.40964
1998	102.55319
1999	102.6936
2000	102.91424
2001	103.04778
2002	103.17848
2003	103.30645
2004	103.43176
2005	103.5545
2006	103.59656
2007	103.79551
2008	103.83436
2009	104.02736
2010	104.06321
2011	104.17599
2012	104.28677
2013	104.32234
2014	104.42992
2015	104.46364