Year	Percent
1990-01-01	6.7956199999999995
1991-01-01	6.2824300000000010
1992-01-01	5.8778000000000000
1993-01-01	5.4599199999999990
1994-01-01	4.7507000000000000
1995-01-01	4.8985300000000000
1996-01-01	4.2991000000000000
1997-01-01	7.9624300000000000
1998-01-01	8.9251899999999990
1999-01-01	8.2378900000000000
2000-01-01	8.9448200000000000
2001-01-01	8.5271200000000000
2002-01-01	8.6831900000000000
2003-01-01	9.9258500000000000
2004-01-01	11.5042000000000000
2005-01-01	11.5724000000000000
2006-01-01	11.5389000000000000
2007-01-01	12.6816000000000000
2008-01-01	13.0487000000000000
2009-01-01	15.7409000000000000
2010-01-01	14.4050000000000000
2011-01-01	14.7325000000000000
2012-01-01	14.2592000000000000
2013-01-01	17.3314000000000000