Year	Percent
1977	82.19842
1978	82.18821
1979	98.30181
1980	104.32823
1982	66.05697
1983	75.65289
1984	69.40107
1985	80.2947
1986	89.25857
1987	94.03782
1988	88.06595
1989	96.1669
1990	77.22778
1991	83.33766
1992	77.30578
1993	103.17854
1994	99.58091
1995	111.20987
1996	139.97338
1997	154.78984
1998	171.24169
1999	214.21613
2000	103.84593
2001	83.5528
2002	117.24743
2003	102.00022
2004	115.08234
2005	126.75199
2006	129.29059
2007	149.25489
2008	66.72461
2009	122.33731
2010	134.56726
2011	106.94514
2012	112.91927
2013	114.71777
2014	116.45958
2015	102.16565
2016	129.80626
2017	143.19411