Year	Percent
1997	0.18045
1998	3.45197
1999	5.92348
2000	1.16758
2001	1.59087
2002	0.74126
2003	1.40929
2004	0.82097
2005	1.10501
2006	0.5635
2007	1.50182
2008	1.53492
2009	3.04227
2010	3.47835
2011	5.40494
2012	10.17041
2013	5.41625
2014	2.73667
2015	0.7599
2016	2.0154