Year	Percent
1990-01-01	4.9092000000000000
1991-01-01	4.3728600000000000
1992-01-01	4.0661600000000000
1993-01-01	4.0604700000000000
1994-01-01	3.7213400000000000
1995-01-01	3.4446100000000000
1996-01-01	2.9339800000000000
1997-01-01	3.8613699999999995
1998-01-01	4.6538200000000000
1999-01-01	4.9905200000000000
2000-01-01	4.8606300000000005
2001-01-01	4.9895900000000000
2002-01-01	5.2822800000000000
2003-01-01	5.6174200000000000
2004-01-01	6.2076000000000000
2005-01-01	6.2604400000000000
2006-01-01	6.3424300000000000
2007-01-01	6.8925600000000005
2008-01-01	7.4420699999999990
2009-01-01	7.9091200000000000
2010-01-01	5.9841200000000000
2011-01-01	5.6981900000000000
2012-01-01	4.5110500000000000
2013-01-01	4.8382000000000000