Year	Percent
1989-01-01	2.6542500000000000
1990-01-01	2.5472099999999998
1991-01-01	2.3881200000000002
1992-01-01	2.2546900000000000
1993-01-01	2.7161500000000000
1994-01-01	2.9881200000000000
1995-01-01	3.1974000000000000
1996-01-01	3.4632099999999997
1997-01-01	3.2612200000000002
1998-01-01	2.7512300000000000
1999-01-01	2.5166000000000000
2000-01-01	2.7074200000000000
2001-01-01	2.7847600000000000
2002-01-01	2.6758200000000000
2003-01-01	2.7063700000000000
2004-01-01	2.3244000000000000
2005-01-01	2.2617400000000000
2006-01-01	2.9356700000000000
2007-01-01	2.9611600000000000
2008-01-01	2.6378000000000000
2009-01-01	2.6600900000000003
2010-01-01	2.9667400000000000
2011-01-01	5.0308699999999990
2012-01-01	5.8365599999999995
2013-01-01	5.8608300000000000
2014-01-01	7.6994000000000000
2015-01-01	9.7219300000000000
2016-01-01	9.6062800000000000