Year	Percent
1983-01-01	16.3139000000000000
1984-01-01	22.8287000000000000
1985-01-01	25.4137000000000000
1986-01-01	19.4101000000000000
1987-01-01	18.2857000000000000
1988-01-01	14.3073000000000000
1989-01-01	11.5589000000000000
1990-01-01	11.3008000000000000
1991-01-01	8.4841400000000000
1992-01-01	6.6734899999999990
1993-01-01	5.9918300000000000
1994-01-01	2.3609400000000003
1995-01-01	2.0623500000000000
1996-01-01	2.0153800000000000
1997-01-01	5.4472900000000000
1998-01-01	8.0105200000000000
1999-01-01	6.5887699999999990
2000-01-01	3.8414500000000000
2001-01-01	2.1257700000000000
2002-01-01	2.9257900000000000
2003-01-01	3.7966200000000000
2004-01-01	3.3619600000000000
2005-01-01	4.9507400000000010
2006-01-01	6.1279200000000000
2007-01-01	3.4678100000000000
2008-01-01	1.5251800000000000
2009-01-01	2.3581300000000000
2010-01-01	17.6342000000000000
2011-01-01	21.5568000000000000
2012-01-01	25.9402000000000000
2013-01-01	25.4432000000000000
2014-01-01	28.1399000000000000
2015-01-01	25.8203000000000000
2016-01-01	28.4626000000000000