Year	Percent
1992	3.33469
1993	3.43339
1995	3.61923
1996	4.50709
1997	4.32273
1998	4.51173
1999	4.13094
2000	4.90546
2001	5.33597
2002	5.42167
2003	6.42198
2004	5.73241
2005	4.92886
2006	5.50651
2007	5.013
2008	5.82098
2009	6.47785
2010	5.72336
2011	5.80388
2012	6.18317
2013	6.21911
2014	5.84072
2015	6.42066
2016	7.42114