Year	Percent
1992	11.08137
1993	17.51733
1994	11.32416
1995	9.77396
1996	9.60235
1997	10.57243
1998	8.35867
1999	9.80582
2000	13.91016
2001	14.66206
2002	13.36924
2003	18.03875
2006	28.70997
2007	23.47918
2008	21.65182
2009	16.54029
2010	19.59312
2011	18.46699
2012	15.31214
2013	15.73121
2014	12.90163
2015	11.76281
2016	11.34885