Year	Percent
1990-01-01	26.8441
1991-01-01	26.0824
1992-01-01	24.5072
1993-01-01	28.9024
1994-01-01	37.5712
1995-01-01	41.8835
1996-01-01	44.2979
1997-01-01	45.8687
1998-01-01	47.7869
1999-01-01	46.0139
2000-01-01	43.7355
2001-01-01	42.7037
2002-01-01	42.4080
2003-01-01	42.0668
2004-01-01	38.9767
2005-01-01	33.4989
2006-01-01	29.7186
2007-01-01	28.6411
2008-01-01	28.1080
2009-01-01	35.1108
2010-01-01	43.1494
2011-01-01	45.2813