Year	Percent
1964-01-01	90.98840000000000
1965-01-01	83.43570000000000
1966-01-01	65.65610000000000
1967-01-01	56.02750000000000
1968-01-01	61.43680000000000
1969-01-01	89.19540000000000
1970-01-01	85.32190000000000
1971-01-01	108.39800000000000
1972-01-01	132.16000000000000
1973-01-01	148.67100000000000
1974-01-01	160.29399999999998
1975-01-01	166.42700000000002
1976-01-01	158.58000000000000
1977-01-01	147.50500000000000
1978-01-01	142.83200000000000
1979-01-01	148.46900000000000
1980-01-01	150.16500000000000
1981-01-01	153.57600000000000
1982-01-01	148.70900000000000
1983-01-01	140.33400000000000
1984-01-01	136.96800000000000
1985-01-01	133.41700000000000
1986-01-01	135.36900000000000
1987-01-01	131.37000000000000
1988-01-01	120.85500000000000
1989-01-01	120.05900000000000
1990-01-01	125.20400000000000
1991-01-01	131.71900000000000
1992-01-01	87.06320000000000
1993-01-01	22.72180000000000
1994-01-01	20.74660000000000
1995-01-01	21.44110000000000
1996-01-01	22.83170000000000
1997-01-01	20.23960000000000
1998-01-01	16.11600000000000
1999-01-01	17.39080000000000
2000-01-01	20.86020000000000
2001-01-01	20.90130000000000
2002-01-01	23.57050000000000
2003-01-01	25.71840000000000
2004-01-01	25.33820000000000
2005-01-01	28.72260000000000
2006-01-01	30.39010000000000
2007-01-01	28.68360000000000
2008-01-01	28.27350000000000
2009-01-01	30.89090000000000
2010-01-01	33.58230000000000
2011-01-01	32.73470000000000
2012-01-01	32.86090000000000
2013-01-01	36.01780000000000
2014-01-01	37.48880000000000
2015-01-01	40.16790000000000
2016-01-01	46.19270000000000