Year	Percent
1990-01-01	1.268330000000000
1991-01-01	1.560290000000000
1992-01-01	2.139720000000000
1993-01-01	2.609290000000000
1994-01-01	3.791450000000000
1995-01-01	5.009490000000000
1996-01-01	6.117300000000000
1997-01-01	7.092289999999999
1998-01-01	8.275089999999999
1999-01-01	8.717510000000000
2000-01-01	8.724980000000000
2001-01-01	9.479250000000000
2002-01-01	9.924480000000000
2003-01-01	10.433200000000000
2004-01-01	10.242600000000000
2005-01-01	9.828320000000000
2006-01-01	9.357320000000000
2007-01-01	8.695980000000000
2008-01-01	9.205219999999999
2009-01-01	21.448100000000000
2010-01-01	34.646800000000000
2011-01-01	36.014400000000000