Year	Percent
1980-01-01	5.0455400000000000
1981-01-01	4.3198700000000000
1982-01-01	5.5749900000000010
1983-01-01	6.9834000000000000
1984-01-01	6.3926500000000000
1985-01-01	6.2808900000000000
1986-01-01	5.8883900000000000
1987-01-01	4.9713100000000000
1988-01-01	5.8584800000000000
1989-01-01	6.7945800000000010
1990-01-01	6.6295000000000000
1991-01-01	5.8840500000000000
1992-01-01	7.0919300000000005
1993-01-01	7.5004200000000000
1994-01-01	8.9031200000000000
1995-01-01	9.3172600000000010
1996-01-01	10.8397000000000000
1997-01-01	12.6094000000000000
1998-01-01	11.8952000000000000
1999-01-01	12.0923000000000000
2000-01-01	14.1663000000000000
2001-01-01	15.9667000000000000
2002-01-01	16.6597000000000000
2003-01-01	18.1481000000000000
2004-01-01	19.4809000000000000
2005-01-01	17.4927000000000000
2006-01-01	14.8875000000000000
2007-01-01	14.1971000000000000
2008-01-01	14.2061000000000000
2009-01-01	16.1362000000000000
2010-01-01	15.7591000000000000
2011-01-01	15.4279000000000000
2012-01-01	15.2803000000000000
2013-01-01	14.5830000000000000
2014-01-01	15.1336000000000000
2015-01-01	15.2388000000000000
2016-01-01	14.2225000000000000