Year	Percent
1996	4.9215
1997	5.2561
1998	6.2241
1999	6.0173
2000	5.9862
2001	4.9982
2002	5.4295
2003	6.1405
2004	5.4262
2005	6.176
2006	6.5896
2007	5.5874
2008	4.2111
2009	5.3922
2010	6.83
2011	7.9469
2012	9.0107
2013	10.557
2014	10.4539
2015	10.1943
2016	8.681
2017	7.4575