Year	Percent
1975-01-01	23.64540000000000
1976-01-01	22.20000000000000
1977-01-01	22.20570000000000
1978-01-01	20.81150000000000
1979-01-01	31.79640000000000
1980-01-01	32.41790000000000
1981-01-01	25.45680000000000
1982-01-01	29.78970000000000
1983-01-01	31.46220000000000
1984-01-01	32.28880000000000
1985-01-01	46.15420000000000
1986-01-01	59.61990000000000
1987-01-01	73.02870000000000
1988-01-01	80.55660000000000
1989-01-01	87.98170000000000
1990-01-01	85.66100000000000
1991-01-01	74.90550000000000
1992-01-01	74.26450000000000
1993-01-01	91.98070000000000
1994-01-01	131.98400000000000
1995-01-01	145.69700000000000
1996-01-01	140.96200000000002
1997-01-01	156.86700000000002
1998-01-01	177.14000000000000
1999-01-01	162.64400000000000
2000-01-01	152.84200000000000
2001-01-01	131.23200000000000
2002-01-01	102.61700000000000
2003-01-01	112.81200000000001
2004-01-01	131.48100000000000
2005-01-01	136.20200000000000
2006-01-01	155.11500000000000
2007-01-01	247.17000000000000
2008-01-01	221.83900000000003
2009-01-01	163.52700000000002
2010-01-01	189.27900000000002
2011-01-01	146.05200000000002
2012-01-01	117.61200000000001
2013-01-01	122.79700000000001
2014-01-01	107.24400000000000
2015-01-01	87.05020000000000
2016-01-01	91.79840000000000
2017-01-01	104.99300000000000