Year	Percent
1960-01-01	29.66240000000000
1961-01-01	28.38100000000000
1962-01-01	28.13140000000000
1963-01-01	28.06140000000000
1964-01-01	28.45050000000000
1965-01-01	29.45170000000000
1966-01-01	28.75180000000000
1967-01-01	27.67870000000000
1968-01-01	27.45890000000000
1969-01-01	27.11270000000000
1970-01-01	24.72360000000000
1971-01-01	26.94250000000000
1972-01-01	30.93140000000000
1973-01-01	32.03760000000000
1974-01-01	33.48140000000000
1975-01-01	32.17690000000000
1976-01-01	31.70730000000000
1977-01-01	31.90030000000000
1978-01-01	35.02500000000000
1979-01-01	38.00590000000000
1980-01-01	38.60010000000000
1981-01-01	37.86040000000000
1982-01-01	39.15900000000000
1983-01-01	41.32300000000000
1984-01-01	41.31940000000000
1985-01-01	40.43310000000000
1986-01-01	40.18260000000000
1987-01-01	39.86430000000000
1988-01-01	39.92300000000000
1989-01-01	41.26130000000000
1990-01-01	43.38660000000000
1991-01-01	43.63450000000000
1992-01-01	42.15550000000000
1993-01-01	41.06230000000000
1994-01-01	41.24950000000000
1995-01-01	53.04420000000000
1996-01-01	66.58710000000000
1997-01-01	71.18380000000000
1998-01-01	77.74240000000000
1999-01-01	86.08820000000000
2000-01-01	94.07400000000000
2001-01-01	70.54010000000000
2002-01-01	69.99290000000000
2003-01-01	78.24730000000000
2004-01-01	92.47140000000000
2005-01-01	110.46900000000000
2006-01-01	129.74700000000000
2007-01-01	147.17800000000000
2008-01-01	168.56200000000000
2009-01-01	174.03200000000000
2010-01-01	152.25600000000000
2011-01-01	123.52600000000001
2012-01-01	112.82799999999999
2013-01-01	106.48899999999999
2014-01-01	89.03540000000000
2015-01-01	56.84530000000000
2016-01-01	49.21580000000000