Year	Percent
1980-01-01	9.903490000000000
1981-01-01	9.703110000000000
1982-01-01	11.047200000000000
1983-01-01	11.517600000000000
1984-01-01	11.173800000000000
1985-01-01	12.102200000000000
1986-01-01	11.808100000000000
1987-01-01	10.397900000000000
1988-01-01	8.880930000000001
1989-01-01	7.517280000000000
1990-01-01	7.622650000000000
1991-01-01	8.843370000000000
1992-01-01	9.516290000000000
1993-01-01	9.584489999999999
1994-01-01	8.465539999999999
1995-01-01	7.938470000000000
1996-01-01	7.748520000000000
1997-01-01	7.575960000000000
1998-01-01	7.101070000000000
1999-01-01	7.003970000000000
2000-01-01	6.347830000000000
2001-01-01	6.055969999999999
2002-01-01	6.340490000000000
2003-01-01	5.550950000000000
2004-01-01	4.918120000000000
2005-01-01	4.756080000000000
2006-01-01	4.793710000000000
2007-01-01	6.021160000000000
2008-01-01	8.717340000000000
2009-01-01	9.336190000000000
2010-01-01	8.997310000000000
2011-01-01	9.132240000000000
2012-01-01	9.673969999999999
2013-01-01	9.489150000000000
2014-01-01	9.703850000000000
2015-01-01	10.098400000000000
2016-01-01	11.834600000000000