Year	Percent
1976	0.44456
1977	0.27448
1978	0.42964
1979	0.14338
1980	0.10305
1981	0.05853
1982	0.16137
1983	0.14825
1984	0.47156
1985	0.73707
1986	0.50549
1987	0.90858
1988	1.1075
1989	1.63406
1990	1.54666
1991	0.60827
1992	0.45636
1993	0.45145
1994	0.56177
1995	0.46265
1996	0.82908
1997	1.32011
1998	0.29188
1999	1.15011
2000	5.79679
2001	-0.61006
2002	0.67277
2003	1.11644
2004	0.21759
2005	0.66484
2006	1.51887
2007	4.18108
2008	3.78089
2009	2.81176
2010	4.298
2011	3.76232
2012	5.04785
2013	2.41839
2014	3.26811
2015	1.78143
2016	2.85649
2017	2.19409