Year	Percent
1960	162.89358
1961	142.48408
1962	138.18131
1963	141.21376
1964	122.14262
1965	123.29488
1966	123.33671
1967	114.35058
1968	125.72038
1969	132.19328
1970	126.09769
1971	119.52903
1972	106.79956
1973	118.4152
1974	149.60803
1975	137.1285
1976	149.49573
1977	162.78485
1978	165.46817
1979	184.72275
1980	202.05464
1981	198.23033
1982	185.41469
1983	166.94848
1984	156.57067
1985	152.36736
1986	148.87074
1987	164.17274
1988	184.9637
1989	179.54198
1990	177.15485
1991	168.51551
1992	161.64486
1993	161.54098
1994	165.9975
1995	181.22164
1996	176.07234
1997	169.9065
1998	167.59495
1999	177.18624
2000	189.18124
2001	184.47943
2002	185.97096
2003	205.1751
2004	216.42137
2005	226.22717
2006	230.10633
2007	214.76366
2008	231.19449
2009	192.1681
2010	199.74746
2011	203.23758
2012	197.05722
2013	194.08245
2014	191.27345
2015	177.39171
2016	168.19197
2017	173.3452