Year	Percent
1973-01-01	26.504100000000000
1974-01-01	27.694400000000000
1975-01-01	25.350600000000000
1976-01-01	23.544300000000000
1977-01-01	21.500700000000000
1978-01-01	21.117200000000000
1979-01-01	21.461900000000000
1980-01-01	21.968400000000000
1981-01-01	23.750500000000000
1982-01-01	26.834400000000000
1983-01-01	31.766300000000000
1984-01-01	34.353800000000000
1985-01-01	34.847600000000000
1986-01-01	31.760400000000000
1987-01-01	31.050800000000000
1988-01-01	36.149100000000000
1989-01-01	40.957600000000000
1990-01-01	44.953800000000000
1991-01-01	46.196000000000005
1992-01-01	50.107700000000000
1993-01-01	52.227600000000000
1994-01-01	49.459900000000000
1995-01-01	48.151400000000000
1996-01-01	48.485900000000000
1997-01-01	56.997600000000000
1998-01-01	62.035300000000000
1999-01-01	65.939200000000000
2000-01-01	81.024500000000000
2001-01-01	91.855900000000000
2002-01-01	98.298999999999990
2003-01-01	114.075000000000000
2004-01-01	137.057000000000020
2005-01-01	193.238000000000000
2006-01-01	263.938000000000000
2007-01-01	263.811000000000000
2008-01-01	216.077000000000000
2009-01-01	195.252000000000000
2010-01-01	186.815999999999970
2011-01-01	166.092000000000000
2012-01-01	144.558000000000000
2013-01-01	127.150000000000000
2014-01-01	114.740000000000000
2015-01-01	102.900000000000000
2016-01-01	95.483800000000000