Year	Percent
1975	-0.01063
1976	-0.0076
1977	-0.03008
1978	0.01335
1979	0.03218
1980	0.04306
1981	0.04815
1982	0.0364
1983	0.00262
1984	0.00919
1985	0.04624
1986	0.04792
1987	0.07712
1988	0.03118
1989	0.08631
1990	0.07474
1991	0.02759
1992	0.09724
1993	0.19972
1994	0.30141
1995	0.60303
1996	0.62583
1997	0.87184
1998	0.63374
1999	0.47903
2000	0.77556
2001	1.07066
2002	1.02525
2003	0.61408
2004	0.77595
2005	0.89868
2006	2.17633
2007	2.10037
2008	3.65695
2009	2.68754
2010	1.65379
2011	2.00207
2012	1.31293
2013	1.51628
2014	1.69566
2015	2.09331
2016	1.95488
2017	1.53864