Year	Percent
1990-01-01	2.2026500000000000
1991-01-01	2.6219799999999998
1992-01-01	2.3026600000000000
1993-01-01	1.3354900000000000
1994-01-01	3.1576100000000000
1995-01-01	2.1978700000000000
1996-01-01	3.8829100000000000
1997-01-01	5.3884300000000005
1998-01-01	3.7672000000000000
1999-01-01	4.5622200000000000
2000-01-01	3.1353800000000000
2001-01-01	3.4467600000000000
2002-01-01	3.0378300000000000
2003-01-01	6.9740699999999990
2004-01-01	6.9779399999999990
2005-01-01	9.5989399999999990
2006-01-01	14.7846000000000000
2007-01-01	8.8306300000000010
2008-01-01	5.7688900000000000
2009-01-01	1.9167500000000000
2010-01-01	6.3687400000000000
2011-01-01	7.7098500000000000
2012-01-01	7.8998300000000010