Year	Percent
1980-01-01	5.134260000000000
1981-01-01	5.576420000000000
1982-01-01	6.228410000000000
1983-01-01	8.240400000000000
1984-01-01	10.918300000000000
1985-01-01	11.584800000000000
1986-01-01	12.305200000000000
1987-01-01	15.126700000000000
1988-01-01	14.253000000000000
1989-01-01	15.212100000000000
1990-01-01	14.080100000000000
1991-01-01	14.336700000000000
1992-01-01	12.547700000000000
1993-01-01	16.875400000000000
1994-01-01	14.888300000000000
1995-01-01	12.772200000000000
1996-01-01	13.157600000000000
1997-01-01	11.445700000000000
1998-01-01	14.070800000000000
1999-01-01	16.031100000000000
2000-01-01	17.506000000000000
2001-01-01	18.650400000000000
2002-01-01	19.858800000000000
2003-01-01	16.127300000000000
2004-01-01	19.459400000000000
2005-01-01	20.900800000000000
2006-01-01	21.661100000000000
2007-01-01	25.346999999999998
2008-01-01	27.916400000000000
2009-01-01	30.767200000000000
2010-01-01	30.307400000000000
2011-01-01	36.151900000000000
2012-01-01	41.081900000000000
2013-01-01	43.849700000000000
2014-01-01	43.304200000000000
2015-01-01	43.225200000000000
2016-01-01	40.467800000000000