Year	Percent
1987-01-01	8.594850000000000
1988-01-01	9.062750000000000
1989-01-01	10.473100000000000
1990-01-01	11.428900000000000
1991-01-01	13.799700000000000
1992-01-01	14.901100000000000
1993-01-01	12.097900000000000
1994-01-01	15.372000000000000
1995-01-01	15.883000000000000
1996-01-01	20.395300000000000
1997-01-01	27.160500000000000
1998-01-01	35.985000000000000
1999-01-01	41.209900000000000
2000-01-01	59.016999999999996
2001-01-01	67.069000000000000
2002-01-01	81.421400000000000
2003-01-01	91.677800000000000
2004-01-01	96.163100000000000
2005-01-01	97.308900000000000
2006-01-01	118.384000000000000
2007-01-01	121.104000000000000
2008-01-01	113.919000000000000
2009-01-01	143.926000000000020
2010-01-01	154.461000000000000
2011-01-01	152.247000000000000
2012-01-01	169.873000000000000
2013-01-01	164.247000000000000
2014-01-01	149.308000000000000
2015-01-01	159.107000000000000
2016-01-01	148.295000000000000