Year	Percent
1993-01-01	51.6382
1994-01-01	43.0428
1995-01-01	35.0388
1996-01-01	37.1025
1997-01-01	46.1009
1998-01-01	51.5138
1999-01-01	52.0351
2000-01-01	50.5113
2001-01-01	42.6526
2002-01-01	36.4274
2003-01-01	33.6727
2004-01-01	29.0294
2005-01-01	30.6774
2006-01-01	34.6171
2007-01-01	33.7932
2008-01-01	37.8512
2009-01-01	44.2671
2010-01-01	43.8465
2011-01-01	45.3506
2012-01-01	46.4494
2013-01-01	47.1357
2014-01-01	48.3940
2015-01-01	50.7785
2016-01-01	54.3179