Year	Percent
1973-01-01	17.01450000000000
1974-01-01	18.00140000000000
1975-01-01	17.92140000000000
1976-01-01	18.47100000000000
1977-01-01	20.86730000000000
1978-01-01	22.68480000000000
1979-01-01	24.38580000000000
1980-01-01	23.40750000000000
1981-01-01	22.93410000000000
1982-01-01	23.68450000000000
1983-01-01	24.35730000000000
1984-01-01	25.02770000000000
1985-01-01	28.42890000000000
1986-01-01	32.17230000000000
1987-01-01	36.72520000000000
1988-01-01	59.84850000000000
1989-01-01	81.86050000000000
1990-01-01	82.42060000000000
1991-01-01	84.12460000000000
1992-01-01	90.77710000000000
1993-01-01	94.20590000000000
1994-01-01	91.99420000000000
1995-01-01	94.38440000000000
1996-01-01	97.87410000000000
1997-01-01	102.31700000000001
1998-01-01	107.92900000000000
1999-01-01	114.80000000000000
2000-01-01	117.96200000000000
2001-01-01	118.58900000000000
2002-01-01	114.56600000000000
2003-01-01	114.75299999999999
2004-01-01	118.66600000000000
2005-01-01	123.87400000000000
2006-01-01	132.78600000000000
2007-01-01	140.47400000000000
2008-01-01	144.59300000000000
2009-01-01	150.59300000000000
2010-01-01	153.46300000000000