Year	Percent
1989-01-01	10.5617000000000000
1990-01-01	3.8789300000000004
1991-01-01	13.0545000000000000
1992-01-01	21.0485000000000000
1993-01-01	23.1224000000000000
1994-01-01	10.9034000000000000
1995-01-01	6.2961400000000000
1996-01-01	8.1943500000000000
1997-01-01	6.0893200000000000
1998-01-01	2.5421200000000000
1999-01-01	2.4085799999999997
2000-01-01	2.6013599999999997
2001-01-01	3.0895900000000003
2002-01-01	2.9373000000000000
2003-01-01	3.8024400000000003
2004-01-01	4.3667200000000000
2005-01-01	3.1488400000000003
2006-01-01	2.3843799999999997
2007-01-01	2.9871900000000000
2008-01-01	3.5843300000000005
2009-01-01	2.0350099999999998
2010-01-01	3.2398100000000000
2011-01-01	5.7422200000000000
2012-01-01	3.0731900000000003