Year	Percent
1983-01-01	20.524700000000000
1984-01-01	19.302500000000000
1985-01-01	19.867300000000000
1986-01-01	20.667800000000000
1987-01-01	17.700300000000000
1988-01-01	17.610000000000000
1989-01-01	20.099700000000000
1990-01-01	21.218200000000000
1991-01-01	22.821400000000000
1992-01-01	25.061300000000000
1993-01-01	26.092700000000000
1994-01-01	27.587500000000000
1995-01-01	30.623600000000000
1996-01-01	32.058100000000000
1997-01-01	36.716500000000000
1998-01-01	41.710800000000000
1999-01-01	43.668100000000000
2000-01-01	43.290000000000000
2001-01-01	48.766300000000000
2002-01-01	49.717300000000000
2003-01-01	49.466900000000000
2004-01-01	49.638300000000000
2005-01-01	51.625000000000000
2006-01-01	52.140500000000000
2007-01-01	50.362500000000000
2008-01-01	58.389200000000000
2009-01-01	69.594500000000000
2010-01-01	73.129700000000000
2011-01-01	68.065500000000000
2012-01-01	62.814100000000000
2013-01-01	58.677800000000000
2014-01-01	60.443000000000005
2015-01-01	61.015600000000000
2016-01-01	62.056300000000000