Year	Percent
1993	41.16322
1994	43.59735
1995	44.26091
1996	67.07486
1997	54.50762
1998	32.35403
1999	30.31548
2000	16.28351
2001	16.33564
2002	17.03533
2003	21.36377
2004	27.91392
2005	16.1199
2006	25.69829
2007	18.33176
2008	18.62921
2009	21.12656
2010	23.72304
2011	23.49915
2012	20.88105
2013	16.49365
2014	18.54866
2015	18.1605
2016	18.07735