Year	Percent
1991-01-01	38.3036
1992-01-01	21.6102
1993-01-01	27.0244
1994-01-01	32.9707
1995-01-01	32.3229
1996-01-01	34.8903
1997-01-01	34.6682
1998-01-01	37.2004
1999-01-01	39.6557
2000-01-01	42.6475
2001-01-01	44.8015
2002-01-01	46.3710
2003-01-01	48.2298
2004-01-01	53.1313
2005-01-01	58.4778
2006-01-01	64.7754
2007-01-01	70.2525
2008-01-01	78.4993
2009-01-01	90.6578
2010-01-01	95.3324
2011-01-01	95.2196
2012-01-01	97.0001
2013-01-01	90.7531
2014-01-01	79.2727
2015-01-01	71.5291
2016-01-01	65.3163