Year	Percent
1983-01-01	29.8464
1984-01-01	43.4447
1985-01-01	47.9789
1986-01-01	42.4598
1987-01-01	40.8076
1988-01-01	41.9921
1989-01-01	34.8017
1990-01-01	25.5464
1991-01-01	19.3490
1992-01-01	22.0267
1993-01-01	16.5160
1994-01-01	25.2312
1995-01-01	22.2023
1996-01-01	27.9746
1997-01-01	29.8424
1998-01-01	30.9957
1999-01-01	35.3705
2000-01-01	37.8182
2001-01-01	40.4982
2002-01-01	33.7884
2003-01-01	35.1005
2004-01-01	35.6479
2005-01-01	31.8204
2006-01-01	41.5003
2007-01-01	45.6030
2008-01-01	48.3976
2009-01-01	50.8555
2010-01-01	48.3130
2011-01-01	46.2035
2012-01-01	42.1021
2013-01-01	41.1214
2014-01-01	38.8673
2015-01-01	37.6278
2016-01-01	33.4137