Year	Percent
1990-01-01	0.2239690000000000
1991-01-01	0.7402280000000000
1992-01-01	1.4521600000000001
1993-01-01	2.4382700000000000
1994-01-01	5.0266400000000000
1995-01-01	9.0625400000000000
1996-01-01	11.9579000000000000
1997-01-01	14.0875000000000000
1998-01-01	16.8013000000000000
1999-01-01	17.3630000000000000
2000-01-01	17.1377000000000000
2001-01-01	17.4913000000000000
2002-01-01	18.1032000000000000
2003-01-01	18.7362000000000000
2004-01-01	18.0632000000000000
2005-01-01	17.6735000000000000
2006-01-01	17.1239000000000000
2007-01-01	15.7308000000000000
2008-01-01	14.5065000000000000
2009-01-01	14.1236000000000000
2010-01-01	14.3407000000000000
2011-01-01	15.2842000000000000