Year	Percent
1992	4.90239
1993	4.63147
1994	4.89855
1995	4.06651
1996	4.06053
1997	4.34072
1998	3.00119
1999	3.30208
2000	3.55317
2001	3.79335
2002	4.0549
2003	3.92236
2004	3.5262
2005	3.5573
2006	3.48467
2007	3.38815
2008	3.33395
2009	4.14067
2010	3.81623
2011	3.45696
2012	3.75134
2013	3.94413
2014	4.10418
2015	4.85134
2016	5.50376
2017	4.26247