Year	Percent
1970	82.15768
1971	91.76788
1972	99.21363
1974	91.69719
1975	89.94012
1976	97.96163
1977	89.97613
1978	94.91124
1980	95.68261
1981	90.01175
1982	94.20118
1983	103.56295
1984	94.15971
1985	91.20482
1986	114.11192
1987	99.27273
1988	86.9773
1989	89.23977
1991	99.07085
1992	101.06007
1993	97.85459
1994	99.75845
1997	103.28068
1998	94.16768
1999	97.69137
2000	97.08738
2001	105.32178
2002	105.28967
2003	106.53009
2004	103.25945
2005	115.0134
2007	111.87845
2008	111.70663
2009	106.22287
2010	112.3696
2011	110.30769
2012	111.32376
2013	116.03306
2014	128.98305
2015	122.95918
2016	129.48929