Year	Percent
1990-01-01	27.5369
1991-01-01	29.3599
1992-01-01	31.7781
1993-01-01	34.6539
1994-01-01	35.6634
1995-01-01	31.5881
1996-01-01	31.6411
1997-01-01	25.1119
1998-01-01	29.1965
1999-01-01	27.9792
2000-01-01	26.2775
2001-01-01	25.8039
2002-01-01	29.3953
2003-01-01	28.7826
2004-01-01	24.2800
2005-01-01	20.4470
2006-01-01	18.4825
2007-01-01	17.2541
2008-01-01	13.6015
2009-01-01	25.3641
2010-01-01	29.1565
2011-01-01	30.2340
2012-01-01	36.1398
2013-01-01	33.4426
2014-01-01	31.5737
2015-01-01	31.2753
2016-01-01	30.7231