Year	Percent
1996	3.85845
1997	3.74454
1998	2.99657
1999	2.9273
2000	2.87184
2001	2.89188
2002	4.10723
2003	4.43462
2004	4.06255
2005	4.7712
2006	6.11941
2007	5.96936
2008	6.55365
2009	8.15013
2010	7.91305
2011	7.46704
2012	7.74577
2013	7.96064
2014	6.88226
2015	7.64851
2016	7.95768