Year	Percent
1995	0.17871
1996	1.17251
1997	2.85047
1998	0.38018
1999	1.80938
2000	1.62387
2001	4.01046
2002	2.53557
2003	2.79527
2004	3.22473
2005	6.23678
2006	9.05798
2007	11.0252
2008	5.18577
2009	6.93219
2010	6.37054
2011	-5.90994
2012	5.56313
2013	3.38621
2014	4.32973
2015	-2.54394
2016	1.6805
2017	2.161