Year	Percent
1975	250.57186
1976	182.04484
1977	122.76775
1978	132.34236
1979	100.34654
1980	80.45975
1981	50.46146
1982	43.64928
1983	36.11655
1984	38.41679
1985	40.05785
1986	51.64365
1987	36.34892
1988	63.00519
1989	66.97622
1990	82.10132
1991	96.31838
1992	123.19528
1993	109.55137
1994	138.90353
1995	190.4652
1996	257.90911
1997	227.98472
1998	274.93236
1999	210.41051
2000	211.80193
2001	201.98665
2002	169.80883
2003	164.10597
2004	183.1631
2005	106.15683
2006	85.68001
2007	139.2823
2008	82.90793
2009	109.20997
2010	126.36565
2011	98.35829
2012	123.73249
2013	118.60278
2014	105.76686
2015	105.47209
2016	104.73182