Year	Percent
1990-01-01	28.950
1991-01-01	29.700
1992-01-01	29.420
1993-01-01	35.500
1994-01-01	39.090
1995-01-01	39.750
1996-01-01	36.490
1997-01-01	6.770
1998-01-01	6.890
1999-01-01	6.390
2000-01-01	4.840
2001-01-01	7.460
2002-01-01	7.690
2003-01-01	8.620
2004-01-01	8.300
2005-01-01	8.795
2006-01-01	10.000
2007-01-01	9.370
2008-01-01	8.650
2009-01-01	9.825
2010-01-01	10.695
2011-01-01	8.770
2012-01-01	10.485
2013-01-01	10.810
2014-01-01	11.375
2015-01-01	10.465