Year	Percent
1980	101.11279
1981	108.20332
1982	118.80881
1983	147.4915
1984	145.38267
1985	157.03491
1986	144.89394
1987	113.91054
1988	150.692
1989	142.80228
1990	49.09827
1991	68.99042
1992	75.06873
1993	78.30311
1994	88.58029
1995	84.3194
1996	98.56956
1997	88.15954
1998	63.21512
1999	70.08145
2000	86.63675
2001	88.07375
2002	84.08878
2003	87.76053
2004	93.94369
2005	100.89545
2006	112.31662
2007	109.15988
2008	108.93448
2009	76.81866
2010	91.17354
2011	105.87244
2012	110.19128
2013	114.56857
2014	112.78155
2015	108.79527
2016	104.32732
2017	112.80657