Year	Percent
1983-01-01	14.6082000000000000
1984-01-01	14.6933000000000000
1985-01-01	16.9800000000000000
1986-01-01	19.9238000000000000
1987-01-01	22.9785000000000000
1988-01-01	24.0367000000000000
1989-01-01	25.7204000000000000
1990-01-01	24.9434000000000000
1991-01-01	33.3661000000000000
1992-01-01	29.8579000000000000
1993-01-01	27.7934000000000000
1994-01-01	34.6083000000000000
1995-01-01	31.8070000000000000
1996-01-01	24.1407000000000000
1997-01-01	19.2040000000000000
1998-01-01	14.4726000000000000
1999-01-01	11.9203000000000000
2000-01-01	9.1640400000000000
2001-01-01	8.1889500000000000
2002-01-01	7.9984899999999990
2003-01-01	7.5828600000000000
2004-01-01	7.3430600000000000
2005-01-01	5.4729500000000000
2006-01-01	4.9561100000000000
2007-01-01	4.8697200000000000
2008-01-01	4.1409199999999995
2009-01-01	5.4244900000000005
2010-01-01	5.3223400000000005
2011-01-01	4.8445300000000010
2012-01-01	5.6899400000000000
2013-01-01	6.0250000000000000
2014-01-01	5.6393500000000000
2015-01-01	5.4539000000000000
2016-01-01	5.6939100000000000