Year	Percent
1990-01-01	1.4560500000000000
1991-01-01	1.5912100000000000
1992-01-01	1.7224300000000000
1993-01-01	2.0349100000000000
1994-01-01	2.2237900000000000
1995-01-01	2.7054300000000000
1996-01-01	2.9125200000000000
1997-01-01	7.4228399999999990
1998-01-01	8.1318700000000000
1999-01-01	7.2066300000000005
2000-01-01	6.8561500000000000
2001-01-01	7.0464899999999995
2002-01-01	7.3814400000000000
2003-01-01	6.7835000000000000
2004-01-01	6.1861800000000000
2005-01-01	5.8671600000000000
2006-01-01	5.2141500000000000
2007-01-01	5.0068699999999990
2008-01-01	4.9609800000000000
2009-01-01	5.0088500000000000
2010-01-01	4.9749700000000000
2011-01-01	4.9409100000000000
2012-01-01	4.9848900000000000
2013-01-01	5.1381900000000000
2014-01-01	5.0340800000000000
2015-01-01	4.6838600000000000
2016-01-01	4.5765100000000000