Year	Percent
1990	6.16137
1991	6.57316
1992	6.8086
1993	6.59929
1994	7.85018
1995	5.96563
1996	4.97266
1997	5.51148
1998	5.73881
1999	4.92034
2000	4.35971
2001	4.80499
2002	6.02075
2003	5.95561
2004	4.70963
2005	4.28349
2006	3.60386
2007	4.09812
2008	3.93592
2009	4.99228
2010	4.68556
2011	5.18762
2012	5.04709
2013	4.74952
2014	5.04205