Year	Percent
1973-01-01	46.638000000000005
1974-01-01	45.976700000000000
1975-01-01	43.620000000000000
1976-01-01	43.484500000000000
1977-01-01	44.356700000000000
1978-01-01	46.357600000000000
1979-01-01	47.470000000000000
1980-01-01	46.797200000000000
1981-01-01	50.395200000000000
1982-01-01	51.757800000000000
1983-01-01	51.209500000000000
1984-01-01	50.443999999999996
1985-01-01	48.701600000000000
1986-01-01	47.442500000000000
1987-01-01	49.998600000000000
1988-01-01	54.856300000000000
1989-01-01	60.512700000000000
1990-01-01	63.040600000000000
1991-01-01	59.999700000000000
1992-01-01	57.706400000000000
1993-01-01	51.791200000000000
1994-01-01	45.520800000000000
1995-01-01	41.418100000000000
1996-01-01	39.977700000000000
1997-01-01	40.488400000000000
1998-01-01	43.116000000000010
1999-01-01	43.728500000000000
2000-01-01	43.867600000000000
2001-01-01	73.067200000000000
2002-01-01	99.736700000000000
2003-01-01	99.871000000000010
2004-01-01	99.951100000000000
2005-01-01	105.339000000000000
2006-01-01	110.294000000000000
2007-01-01	115.709000000000000
2008-01-01	125.257000000000000
2009-01-01	134.094000000000000
2010-01-01	129.997000000000000
2011-01-01	132.158000000000000
2012-01-01	136.646000000000020
2013-01-01	137.822000000000000
2014-01-01	136.585000000000000
2015-01-01	133.055000000000000
2016-01-01	132.361000000000000