Year	Percent
1998	1.79981
1999	1.53517
2000	2.55313
2001	2.74109
2002	2.34898
2003	2.48004
2004	1.95234
2005	1.74419
2006	1.97312
2007	1.73861
2008	1.67749
2009	3.84461
2010	-0.4199
2011	1.0569
2012	2.52974
2013	3.42195
2014	-0.11534
2015	1.23395
2016	0.65295
2017	1.11457