Year	Percent
2001	17.75478
2002	17.92588
2003	19.2408
2004	19.24265
2005	19.31588
2006	19.82602
2007	19.94462
2008	21.84368
2009	21.5399
2010	22.4377
2011	22.34224
2013	22.68506
2014	22.20864