Year	Percent
1997	6.75906
1998	8.62972
1999	7.66954
2000	8.32372
2001	5.61211
2002	4.87553
2003	4.69231
2004	4.61148
2005	3.65647
2006	3.22597
2007	3.28052
2008	3.66802
2009	5.45711
2010	6.03859
2011	5.46631
2012	5.07556
2013	6.03469
2014	5.64365