Year	Percent
1990-01-01	19.998700000000000
1991-01-01	21.453600000000000
1992-01-01	27.541900000000000
1993-01-01	32.292200000000000
1994-01-01	32.352800000000000
1995-01-01	36.868100000000000
1996-01-01	38.645700000000000
1997-01-01	39.837100000000000
1998-01-01	40.961100000000000
1999-01-01	40.644200000000000
2000-01-01	35.990300000000000
2001-01-01	36.049900000000000
2002-01-01	32.291600000000000
2003-01-01	33.707100000000000
2004-01-01	33.570600000000000
2005-01-01	34.513000000000005
2006-01-01	35.524100000000000
2007-01-01	37.439500000000000
2008-01-01	37.653500000000000
2009-01-01	49.810300000000000
2010-01-01	59.067800000000000
2011-01-01	59.366300000000000
2012-01-01	54.182800000000000
2013-01-01	51.677500000000000
2014-01-01	50.624900000000000
2015-01-01	51.240600000000000
2016-01-01	51.098700000000000