Year	Percent
1990-01-01	44.3068
1991-01-01	39.1915
1992-01-01	37.1491
1993-01-01	38.7625
1994-01-01	39.6825
1995-01-01	36.9991
1996-01-01	32.4105
1997-01-01	33.1161
1998-01-01	36.3719
1999-01-01	29.9873
2000-01-01	30.1490
2001-01-01	30.0639
2002-01-01	31.3746
2003-01-01	32.8735
2004-01-01	32.6521
2005-01-01	29.7531
2006-01-01	30.5088
2007-01-01	31.7805
2008-01-01	31.4203
2009-01-01	35.5970
2010-01-01	29.8732
2011-01-01	31.3376
2012-01-01	30.7086
2013-01-01	32.7087