Year	Percent
1976-01-01	40.353600000000000
1977-01-01	43.135300000000000
1978-01-01	32.931900000000000
1979-01-01	23.756900000000000
1980-01-01	26.874500000000000
1981-01-01	26.719100000000000
1982-01-01	24.758300000000000
1983-01-01	24.287500000000000
1984-01-01	22.155200000000000
1985-01-01	23.090300000000000
1986-01-01	24.131900000000000
1987-01-01	21.808800000000000
1988-01-01	17.639800000000000
1989-01-01	15.158800000000000
1990-01-01	14.305700000000000
1991-01-01	15.085100000000000
1992-01-01	17.270700000000000
1993-01-01	20.407200000000000
1994-01-01	21.741800000000000
1995-01-01	19.055900000000000
1996-01-01	16.759400000000000
1997-01-01	12.472500000000000
1998-01-01	11.933300000000000
1999-01-01	12.277999999999999
2000-01-01	13.618000000000000
2001-01-01	15.275000000000000
2002-01-01	15.562800000000000
2003-01-01	12.001700000000000
2004-01-01	8.156480000000000
2005-01-01	10.311300000000000
2006-01-01	8.376570000000000
2007-01-01	7.189089999999999
2008-01-01	9.092450000000000
2009-01-01	12.647700000000000
2010-01-01	12.365800000000000
2011-01-01	9.724039999999999
2012-01-01	10.069400000000000
2013-01-01	11.109200000000000
2014-01-01	11.185100000000000
2015-01-01	10.467400000000000
2016-01-01	11.349900000000000