Year	Percent
1992	17.47514
1993	26.11101
1994	31.1113
1995	31.12241
1996	32.87694
1997	32.34032
1998	67.80258
1999	95.67101
2000	57.9767
2001	46.68259
2002	40.89679
2003	44.56266
2004	37.04428
2005	33.51242
2006	32.38544
2007	32.75752
2008	25.97189
2009	34.35873
2010	28.27434
2011	27.60973
2012	28.15375
2013	31.07573
2014	27.52885
2015	35.19111
2016	42.02364