Year	Percent
1991-01-01	16.2162
1992-01-01	15.7365
1993-01-01	23.9132
1994-01-01	29.0901
1995-01-01	31.1271
1996-01-01	27.0912
1997-01-01	22.7462
1998-01-01	24.2783
1999-01-01	24.3833
2000-01-01	20.8914
2001-01-01	18.4202
2002-01-01	15.0466
2003-01-01	13.6991
2004-01-01	14.7752
2005-01-01	16.0011
2006-01-01	22.4404
2007-01-01	23.0931
2008-01-01	22.8078
2009-01-01	28.6840
2010-01-01	26.4045
2011-01-01	25.3825
2012-01-01	28.0117
2013-01-01	31.4511
2014-01-01	27.6817
2015-01-01	28.2181
2016-01-01	24.8058