Year	Percent
1996	27.8529
1997	12.50182
1998	5.64623
1999	44.83098
2000	27.3285
2001	12.08801
2002	9.82864
2003	14.86563
2004	7.98666
2005	9.34452
2006	13.41947
2007	15.90683
2008	9.24434
2009	2.17013
2010	11.07095
2011	7.26162
2012	7.89448
2013	4.1326
2014	6.37542
2015	9.82171
2016	5.71421
2017	6.27546