Year	Percent
1996	1.61498
1997	2.4938
1998	4.58484
1999	23.88641
2000	10.85047
2001	38.1431
2002	41.09938
2003	24.65037
2004	38.25047
2005	22.58551
2006	16.46626
2007	7.48734
2008	2.68785
2009	3.94824
2010	1.86129
2011	1.34923
2012	2.38741
2013	2.39773
2014	3.0195
2015	5.56708
2016	3.89919