Year	Percent
1979-01-01	54.12060000000000
1980-01-01	43.58010000000000
1981-01-01	92.82340000000000
1982-01-01	62.83350000000000
1983-01-01	51.24910000000000
1984-01-01	71.78230000000000
1985-01-01	61.68400000000000
1986-01-01	104.21700000000001
1987-01-01	108.60200000000000
1988-01-01	129.94400000000000
1989-01-01	98.08160000000000
1990-01-01	59.86390000000000
1991-01-01	79.63040000000000
1992-01-01	114.91600000000000
1993-01-01	171.37400000000002
1994-01-01	171.30200000000002
1995-01-01	95.58240000000000
1996-01-01	111.84000000000000
1997-01-01	211.54500000000000
1998-01-01	222.83599999999998
1999-01-01	347.56500000000000
2000-01-01	199.72500000000000
2001-01-01	193.06099999999998
2002-01-01	234.82400000000000
2003-01-01	153.76600000000000
2004-01-01	135.41899999999998
2005-01-01	199.36300000000000
2006-01-01	165.85600000000000
2007-01-01	193.42200000000000
2008-01-01	164.45300000000000
2009-01-01	271.66700000000003
2010-01-01	161.26700000000000
2011-01-01	179.29800000000000
2012-01-01	146.39200000000000
2013-01-01	108.28900000000000
2014-01-01	102.19800000000000
2015-01-01	155.74200000000002
2016-01-01	130.34200000000000
2017-01-01	130.84799999999998