Year	Percent
1991-01-01	8.361450000000000
1992-01-01	8.052389999999999
1993-01-01	7.845540000000000
1994-01-01	7.885739999999999
1995-01-01	7.684870000000000
1996-01-01	7.652760000000001
1997-01-01	8.081020000000000
1998-01-01	9.107410000000000
1999-01-01	11.149100000000000
2000-01-01	13.600200000000000
2001-01-01	18.479500000000000
2002-01-01	30.889700000000000
2003-01-01	36.677200000000000
2004-01-01	34.998400000000000
2005-01-01	32.454300000000000
2006-01-01	42.539500000000000
2007-01-01	40.964400000000000
2008-01-01	27.695300000000000
2009-01-01	29.073700000000000
2010-01-01	22.730800000000000
2011-01-01	20.805900000000000
2012-01-01	19.608200000000000
2013-01-01	20.027400000000000
2014-01-01	22.243000000000002
2015-01-01	28.464000000000002
2016-01-01	30.597300000000000