Year	Percent
1998-01-01	53.9216
1999-01-01	60.5634
2000-01-01	55.4745
2001-01-01	31.6901
2002-01-01	34.6847
2003-01-01	28.1457
2004-01-01	33.5593
2005-01-01	38.3178
2006-01-01	34.9680
2007-01-01	37.4046
2008-01-01	30.0455
2009-01-01	24.0427
2010-01-01	34.2784
2011-01-01	23.3771
2012-01-01	26.7692
2013-01-01	32.2658
2014-01-01	29.3047