Year	Percent
1992-01-01	22.32000
1993-01-01	11.95000
1994-01-01	10.41000
1995-01-01	7.13000
1996-01-01	7.03000
1997-01-01	6.43000
1998-01-01	5.30000
1999-01-01	5.65000
2000-01-01	5.46000
2001-01-01	5.23000
2002-01-01	4.30000
2003-01-01	5.10000
2004-01-01	4.80000
2005-01-01	4.50000
2006-01-01	4.40000
2007-01-01	2.53000
2008-01-01	2.99000
2009-01-01	4.54472