Year	Percent
1975-01-01	40.401900000000000
1976-01-01	42.215500000000000
1977-01-01	41.554100000000000
1978-01-01	36.201900000000000
1979-01-01	35.398600000000000
1980-01-01	45.361600000000000
1981-01-01	41.341200000000000
1982-01-01	40.921100000000000
1983-01-01	44.877300000000000
1984-01-01	42.514600000000000
1985-01-01	44.873000000000005
1986-01-01	52.556100000000000
1987-01-01	52.385200000000000
1988-01-01	50.667000000000000
1989-01-01	54.659500000000000
1990-01-01	54.563200000000000
1991-01-01	58.768700000000000
1992-01-01	66.732000000000000
1993-01-01	71.456300000000000
1994-01-01	71.322200000000000
1995-01-01	79.143999999999990
1996-01-01	95.619000000000000
1997-01-01	112.103000000000000
1998-01-01	130.576000000000000
1999-01-01	143.673000000000000
2000-01-01	146.192999999999980
2001-01-01	138.332000000000000
2002-01-01	114.902000000000000
2003-01-01	110.685000000000000
2004-01-01	125.554000000000000
2005-01-01	128.392000000000000
2006-01-01	133.386000000000000
2007-01-01	137.361000000000000
2008-01-01	109.698000000000000
2009-01-01	92.957300000000000
2010-01-01	108.321000000000000
2011-01-01	107.384000000000000
2012-01-01	107.025000000000000
2013-01-01	128.708000000000000
2014-01-01	146.209000000000000
2015-01-01	142.648000000000000
2016-01-01	141.286000000000000
2017-01-01	153.960000000000000