Year	Percent
1970	47.6361
1971	50.90942
1972	51.58871
1973	54.63405
1974	55.1382
1982	69.28217
1983	72.52274
1984	72.98931
1985	67.21334
1986	69.9712
1987	69.46876
1988	68.64425
1989	68.05699
1990	71.6812
1991	70.57676
1992	78.64838
1993	79.39189
1994	79.21365
1995	83.44215
1996	85.19361
1998	92.20902
1999	94.35303
2000	94.98594
2001	92.97807
2002	94.11946
2004	103.52074
2005	108.41745
2006	115.74745
2007	118.56749
2008	119.18492
2009	124.10546
2010	122.44015
2011	119.93548
2012	113.19153
2013	102.10829
2014	100.60181
2015	100.46642
2016	101.39393