Year	Percent
1980	0.00218
1981	0.00105
1982	0.0005
1983	0.00232
1984	0.00191
1985	0.00131
1986	-0.00041
1987	0.00182
1988	0.00376
1989	0.00342
1990	0.00189
1991	-0.00413
1992	0.00844
1993	0.00013
1994	0.02557
1995	0.03297
1996	0.06174
1997	0.02752
1998	0.01145
1999	0.01753
2000	0.11025
2001	0.22009
2002	0.24821
2003	0.20645
2004	0.26255
2005	0.32646
2006	1.52522
2007	1.41753
2008	1.62235
2009	1.21573
2010	0.9639
2011	0.69159
2012	0.46799
2013	0.09506
2014	0.57311
2015	0.35742
2016	0.22193
2017	0.42696