Year	Percent
1989-01-01	4.0767500000000000
1990-01-01	3.6407900000000000
1991-01-01	3.4032199999999997
1992-01-01	3.7922800000000003
1993-01-01	5.5949599999999995
1994-01-01	6.7165300000000006
1995-01-01	6.6805900000000000
1996-01-01	6.5078700000000000
1997-01-01	7.7235400000000000
1998-01-01	15.0940000000000010
1999-01-01	14.0038000000000000
2000-01-01	13.7459999999999990
2001-01-01	14.7115000000000000
2002-01-01	15.5401000000000000
2003-01-01	16.8070000000000020
2004-01-01	17.1147000000000000
2005-01-01	16.6657000000000000
2006-01-01	16.0229000000000000
2007-01-01	18.4556000000000000
2008-01-01	21.2774000000000000
2009-01-01	24.5171000000000000
2010-01-01	29.7899000000000000