Year	Percent
1980-01-01	6.1821600000000000
1981-01-01	5.9110200000000000
1982-01-01	5.8243900000000000
1983-01-01	6.4950700000000000
1984-01-01	7.3538600000000010
1985-01-01	6.7069399999999995
1986-01-01	7.5640300000000010
1987-01-01	8.3752300000000000
1988-01-01	8.3804600000000010
1989-01-01	8.4134600000000000
1990-01-01	8.6652899999999990
1991-01-01	9.1579400000000000
1992-01-01	9.8274500000000000
1993-01-01	10.3445000000000000
1994-01-01	11.6997000000000000
1995-01-01	10.5250000000000000
1996-01-01	10.8918000000000000
1997-01-01	12.0608000000000000
1998-01-01	12.4083000000000000
1999-01-01	13.6821000000000000
2000-01-01	15.3107000000000000
2001-01-01	17.3292000000000000
2002-01-01	20.0974000000000000
2003-01-01	22.3786000000000000
2004-01-01	21.4360000000000000
2005-01-01	18.9088000000000000
2006-01-01	17.2930000000000000
2007-01-01	18.5122000000000000
2008-01-01	19.4523000000000000
2009-01-01	21.2742000000000000
2010-01-01	18.8679000000000000
2011-01-01	19.6469000000000000
2012-01-01	19.7247000000000000
2013-01-01	19.8866000000000000
2014-01-01	19.7035000000000000
2015-01-01	19.7981000000000000
2016-01-01	23.7698000000000000