Year	Percent
1990-01-01	47.72170000000000000
1991-01-01	41.95620000000000000
1992-01-01	40.66280000000000000
1993-01-01	43.05960000000000000
1994-01-01	43.93840000000000000
1995-01-01	35.34430000000000000
1996-01-01	25.92400000000000000
1997-01-01	19.23780000000000000
1998-01-01	21.47540000000000000
1999-01-01	13.48210000000000000
2000-01-01	1.26632000000000010
2001-01-01	0.73524600000000000
2002-01-01	0.15152200000000000
2003-01-01	0.09356400000000000
2004-01-01	0.11887400000000001
2005-01-01	0.11343299999999999
2006-01-01	0.10275000000000000
2007-01-01	0.17493399999999998
2008-01-01	1.87389000000000000
2009-01-01	5.76603000000000100
2010-01-01	7.04413000000000000
2011-01-01	10.16250000000000000
2012-01-01	11.75520000000000000
2013-01-01	11.21870000000000000