Year	Percent
1996	2.22709
1997	4.43398
1998	13.69324
1999	8.53754
2000	4.58982
2001	8.84983
2002	7.89582
2003	5.14832
2004	2.17736
2005	1.05641
2006	1.75004
2007	3.39973
2008	0.92329
2009	0.98305
2010	1.08393
2011	1.34769
2012	7.26849
2013	13.42318
2014	7.00247
2015	2.53387
2016	2.0835