Year	Percent
1989-01-01	2.5032300000000000
1990-01-01	2.7281299999999997
1991-01-01	2.8432800000000000
1992-01-01	2.7548700000000000
1993-01-01	3.6921800000000005
1994-01-01	4.9236000000000000
1995-01-01	5.4425400000000000
1996-01-01	5.4262600000000000
1997-01-01	6.5887400000000000
1998-01-01	11.8726000000000000
1999-01-01	9.3004800000000000
2000-01-01	8.4711000000000000
2001-01-01	10.0094000000000000
2002-01-01	9.9887800000000000
2003-01-01	8.7151300000000000
2004-01-01	7.9445200000000000
2005-01-01	8.2066000000000000
2006-01-01	7.5327899999999990
2007-01-01	7.4260600000000005
2008-01-01	9.6385700000000000
2009-01-01	14.0336000000000000
2010-01-01	19.1309000000000000