Year	Percent
1961	6.25717
1962	5.5653
1963	-3.09475
1964	2.42781
1965	0.86444
1966	13.19287
1967	-3.00671
1968	1.22055
1969	2.70631
1970	51.27848
1971	1.34803
1972	2.89287
1973	5.34684
1974	43.94637
1975	23.50079
1976	14.35319
1977	10.71375
1978	13.91475
1979	11.48876
1980	12.41966
1981	18.45904
1982	4.82934
1983	13.76747
1984	13.26743
1985	5.54234
1986	11.63
1987	67.39822
1988	22.92167
1989	45.04047
1990	9.29085
1991	17.60477
1992	68.06319
1993	26.1324
1994	31.00914
1995	113.07639
1996	32.72709
1997	1.01313
1998	-5.66569
1999	17.05014
2000	35.22953
2001	-0.32262
2002	39.89666
2003	11.14094
2004	-0.15775
2005	22.0244
2006	17.33778
2007	4.77074
2008	10.8353
2009	-4.32057
2010	103.8228
2011	9.5101
2012	9.27124
2013	5.8733
2014	4.66262
2015	2.86367
2016	9.54367
2017	11.11654