Year	Percent
1998-01-01	22.197700000000000
1999-01-01	25.410000000000000
2000-01-01	28.200000000000000
2001-01-01	20.600000000000000
2002-01-01	32.359600000000000
2003-01-01	28.819800000000000
2004-01-01	30.116999999999997
2005-01-01	30.320500000000000
2006-01-01	33.700800000000000
2007-01-01	35.909100000000000
2008-01-01	34.064800000000000
2009-01-01	33.128600000000000
2010-01-01	39.437200000000000
2011-01-01	35.577400000000000
2012-01-01	29.215700000000000