Year	Percent
1990	3.18775
1995	2.62889
1996	1.75872
1997	1.03481
2000	1.38885
2001	1.37644
2002	1.05865
2003	2.85944
2004	2.06284
2005	2.08243
2006	2.54078
2007	2.92912
2008	1.96534
2009	2.51691
2010	4.8688
2011	5.90345
2012	3.74023
2013	2.67404
2014	4.91521
2015	3.70926