Year	Percent
1980-01-01	7.226360000000001
1981-01-01	8.206910000000000
1982-01-01	9.627110000000000
1983-01-01	9.477160000000001
1984-01-01	9.646000000000000
1985-01-01	10.241900000000000
1986-01-01	11.845100000000000
1987-01-01	11.515400000000000
1988-01-01	10.819900000000000
1989-01-01	10.355300000000000
1990-01-01	10.441200000000000
1991-01-01	11.253500000000000
1992-01-01	11.289400000000000
1993-01-01	12.171700000000000
1994-01-01	12.556800000000000
1995-01-01	12.208100000000000
1996-01-01	12.221200000000000
1997-01-01	12.847100000000000
1998-01-01	15.517999999999999
1999-01-01	15.972700000000000
2000-01-01	14.453500000000000
2001-01-01	17.398400000000000
2002-01-01	18.589200000000000
2003-01-01	19.337700000000000
2004-01-01	19.357200000000000
2005-01-01	18.226100000000000
2006-01-01	19.336300000000000
2007-01-01	23.162100000000000
2008-01-01	23.681500000000000
2009-01-01	31.699800000000000
2010-01-01	30.550900000000000
2011-01-01	29.307600000000000
2012-01-01	30.804100000000000
2013-01-01	33.653100000000000
2014-01-01	35.023500000000000
2015-01-01	41.628200000000000
2016-01-01	46.393700000000000