Year	Percent
1983-01-01	17.0596000000000000
1984-01-01	10.5917000000000000
1985-01-01	22.5589000000000000
1986-01-01	19.6337000000000000
1987-01-01	17.8993000000000000
1988-01-01	19.2955000000000000
1989-01-01	16.4807000000000000
1990-01-01	12.8929000000000000
1991-01-01	6.9951000000000000
1992-01-01	6.5183800000000005
1993-01-01	6.1746500000000000
1994-01-01	5.4656500000000000
1995-01-01	6.5976200000000000
1996-01-01	6.3601199999999990
1997-01-01	6.6699500000000000
1998-01-01	6.8024200000000000
1999-01-01	8.8107400000000000
2000-01-01	10.4341000000000000
2001-01-01	11.3217000000000000
2002-01-01	16.6246000000000000
2003-01-01	15.0178000000000000
2004-01-01	13.7993000000000000
2005-01-01	9.6140800000000000
2006-01-01	11.6417000000000000
2007-01-01	20.0933000000000000
2008-01-01	12.1239000000000000
2009-01-01	11.0316000000000000
2010-01-01	10.6227000000000000
2011-01-01	11.5747000000000000
2012-01-01	13.0433000000000000
2013-01-01	12.8044000000000000
2014-01-01	12.2314000000000000
2015-01-01	12.4401000000000000
2016-01-01	12.2168000000000000