Year	Percent
1970	79.62849
1971	78.21974
1972	82.51035
1973	97.53357
1974	131.66359
1975	113.99593
1976	123.37514
1977	128.55519
1978	115.62262
1979	118.22701
1980	113.65799
1981	105.26998
1982	97.20392
1983	94.015
1984	100.83238
1985	103.68254
1986	96.44067
1987	99.58614
1988	102.35337
1989	109.64919
1990	121.58622
1991	122.32543
1992	128.09778
1993	130.2609
1994	133.96385
1995	139.66788
1996	126.93712
1997	113.16003
1998	114.74045
1999	116.80043
2000	136.23325
2001	100.48516
2002	99.66163
2003	100.42436
2004	101.56434
2005	95.0699
2006	105.11265
2007	104.54225
2008	97.82168
2009	86.00997
2010	98.9353
2011	112.31018
2012	117.79292
2013	96.39711
2014	86.77314
2015	81.81991
2016	84.65582
2017	66.38223