Year	Percent
1990	6.86521
1991	7.32569
1992	8.31395
1993	7.81983
1994	6.76523
1995	7.71473
1996	8.52966
1997	8.69767
1998	9.37193
1999	10.24715
2000	10.06498
2001	10.86303
2002	11.88055
2003	11.67386
2004	11.55274
2005	11.20539
2006	11.85697
2007	12.05936
2008	11.27383
2009	10.33554
2010	10.43528
2011	10.8378
2012	10.83596
2013	10.92612
2014	10.81807
2015	10.21309
2016	10.39394