Year	Percent
1992	0.50968
1993	23.62224
1994	44.30791
1995	53.55572
1996	72.27823
1997	118.56746
1998	96.55918
1999	130.70466
2000	138.40868
2001	112.81329
2002	107.61594
2003	86.73336
2004	58.18804
2005	50.20346
2006	39.14272
2007	36.99549
2008	48.7936
2009	54.3264
2010	51.10585
2011	47.1796
2012	47.41822
2013	43.58276
2014	45.34067
2015	53.32502
2016	59.72486