Year	Percent
1977	0.11717
1978	0.12029
1984	0.0326
1985	0.2161
1986	0.26073
1987	0.06027
1988	0.0268
1989	0.16318
1990	0.17423
1991	0.27153
1992	0.89302
1993	1.57272
1994	1.43492
1995	0.50776
1996	0.12979
1997	-0.00496
1998	0.02422
1999	0.48714
2000	4.5524
2001	4.20904
2002	2.56767
2003	0.08999
2004	2.41267
2005	2.29063
2006	3.73548
2007	5.8585
2008	6.157
2009	0.07763
2010	1.26149
2011	1.80646
2012	-0.17815
2013	1.3911
2014	2.98291
2015	2.88143
2016	2.20293
2017	3.23449