Year	Percent
2000	7.3303
2001	5.7218
2002	4.1704
2003	4.5796
2004	5.4244
2005	6.4823
2006	5.4013
2007	4.5762
2008	4.2411
2009	5.4682
2010	6.4149
2011	7.6328
2012	11.0524
2013	15.159
2014	15.0637
2015	14.772
2016	13.3178
2017	11.2617