Year	Percent
1973-01-01	33.166800000000000
1974-01-01	34.056500000000000
1975-01-01	37.914700000000000
1976-01-01	37.821000000000000
1977-01-01	38.887200000000000
1978-01-01	41.249900000000000
1979-01-01	51.460300000000000
1980-01-01	34.678800000000000
1981-01-01	36.316000000000000
1982-01-01	39.773500000000000
1983-01-01	41.866900000000000
1984-01-01	37.727300000000000
1985-01-01	34.624100000000000
1986-01-01	28.382200000000000
1987-01-01	24.851600000000000
1988-01-01	36.938700000000000
1989-01-01	55.100800000000000
1990-01-01	44.875600000000000
1991-01-01	29.914100000000000
1992-01-01	35.908400000000000
1993-01-01	45.826100000000000
1994-01-01	50.010000000000000
1995-01-01	47.397200000000000
1996-01-01	51.090600000000000
1997-01-01	54.900100000000000
1998-01-01	55.946300000000000
1999-01-01	57.608999999999995
2000-01-01	61.898300000000000
2001-01-01	61.764100000000000
2002-01-01	57.969300000000000
2003-01-01	60.062400000000000
2004-01-01	61.062100000000000
2005-01-01	64.971300000000000
2006-01-01	69.505600000000000
2007-01-01	73.041900000000000
2008-01-01	75.817800000000000
2009-01-01	80.278200000000000
2010-01-01	80.514300000000000
2011-01-01	87.025500000000000
2012-01-01	92.650700000000000
2013-01-01	94.646900000000000
2014-01-01	95.846000000000000
2015-01-01	102.325000000000000
2016-01-01	105.751000000000000