Year	Percent
1990-01-01	4.23727
1991-01-01	6.09053
1992-01-01	10.47970
1993-01-01	19.84360
1994-01-01	26.48620
1995-01-01	28.02250
1996-01-01	32.27220
1997-01-01	35.27650
1998-01-01	37.73980
1999-01-01	35.80090
2000-01-01	30.62750
2001-01-01	27.27050
2002-01-01	24.12780
2003-01-01	20.10050
2004-01-01	15.49050
2005-01-01	11.48250
2006-01-01	9.14631
2007-01-01	9.94765
2008-01-01	9.59165
2009-01-01	10.64730
2010-01-01	12.63200
2011-01-01	12.24710