Year	Percent
1980-01-01	2.545260000000000
1981-01-01	2.883340000000000
1982-01-01	3.107760000000000
1983-01-01	2.911200000000000
1984-01-01	3.665600000000000
1985-01-01	2.899060000000000
1986-01-01	4.177840000000000
1987-01-01	5.663280000000000
1988-01-01	4.215070000000000
1989-01-01	4.363560000000000
1990-01-01	4.598740000000000
1991-01-01	4.926860000000000
1992-01-01	6.081480000000000
1993-01-01	5.529860000000000
1994-01-01	8.238990000000000
1995-01-01	5.161910000000000
1996-01-01	6.224170000000000
1997-01-01	6.263860000000000
1998-01-01	8.216540000000000
1999-01-01	7.508210000000001
2000-01-01	7.369820000000000
2001-01-01	8.706250000000000
2002-01-01	9.468060000000001
2003-01-01	11.610200000000000
2004-01-01	8.754520000000000
2005-01-01	9.137220000000000
2006-01-01	9.650250000000000
2007-01-01	9.823189999999999
2008-01-01	9.248860000000000
2009-01-01	11.420800000000000
2010-01-01	14.536100000000000
2011-01-01	10.979700000000000
2012-01-01	13.532700000000000
2013-01-01	13.316600000000000
2014-01-01	13.244600000000000
2015-01-01	12.930000000000000
2016-01-01	13.726300000000000