Year	Percent
1961	0.0434
1962	-1.25192
1963	0.42728
1964	5.07315
1965	1.32272
1966	3.66107
1967	1.26634
1968	4.48996
1969	1.17181
1970	2.43874
1971	3.03166
1972	4.25073
1973	16.66421
1974	21.79129
1975	4.73203
1976	10.434
1977	11.85247
1978	3.77127
1979	31.65848
1980	36.97863
1981	11.72112
1982	16.74572
1983	11.00199
1984	38.962
1985	167.18897
1986	281.4602
1987	523.08095
1988	13611.63482
1989	4709.18231
1990	5018.18524
1991	4523.69817
1992	23.6664
1993	20.38945
1994	133.70506
1995	13.39268
1996	9.60681
1997	9.77799
1998	14.02849
1999	9.22623
2000	8.56623
2001	7.24151
2002	3.24838
2003	5.33108
2004	9.0509
2005	9.86709
2006	8.22962
2007	9.67391
2008	16.19915
2009	6.0363
2010	6.13809
2011	10.21483
2012	6.24336
2013	4.34916
2014	8.39274
2015	6.38428
2016	4.89152
2017	4.91149