Year	Percent
1975-01-01	26.96040000000000
1976-01-01	30.91030000000000
1977-01-01	35.28230000000000
1978-01-01	38.11460000000000
1979-01-01	16.14260000000000
1980-01-01	15.98960000000000
1981-01-01	17.62190000000000
1982-01-01	21.21140000000000
1983-01-01	32.90450000000000
1984-01-01	33.83030000000000
1985-01-01	43.10830000000000
1986-01-01	41.01170000000000
1987-01-01	47.53150000000000
1988-01-01	30.61180000000000
1989-01-01	38.45360000000000
1990-01-01	29.01570000000000
1991-01-01	29.80360000000000
1992-01-01	25.29940000000000
1993-01-01	29.62930000000000
1994-01-01	36.87430000000000
1995-01-01	42.66130000000000
1996-01-01	52.64810000000000
1997-01-01	62.54430000000000
1998-01-01	75.97080000000000
1999-01-01	65.71620000000000
2000-01-01	104.34899999999999
2001-01-01	79.86520000000000
2002-01-01	112.10500000000000
2003-01-01	110.07900000000000
2004-01-01	115.84400000000000
2005-01-01	104.12400000000000
2006-01-01	130.19400000000000
2007-01-01	169.51800000000000
2008-01-01	135.16500000000000
2009-01-01	115.87100000000001
2010-01-01	92.78580000000000
2011-01-01	79.54330000000000
2012-01-01	69.16199999999999
2013-01-01	63.42940000000000
2014-01-01	58.95950000000000