Year	Percent
1998-01-01	32.8942
1999-01-01	31.7916
2000-01-01	33.5000
2001-01-01	34.5000
2002-01-01	29.2739
2003-01-01	34.5662
2004-01-01	34.1130
2005-01-01	34.8955
2006-01-01	44.8801
2007-01-01	47.2464
2008-01-01	41.7074
2009-01-01	43.2732
2010-01-01	46.4811
2011-01-01	46.6723
2012-01-01	45.3777