Year	Percent
1975-01-01	32.77320000000000
1976-01-01	30.13610000000000
1977-01-01	35.13720000000000
1978-01-01	38.36010000000000
1979-01-01	21.02170000000000
1980-01-01	6.26575000000000
1981-01-01	19.82300000000000
1982-01-01	35.34810000000000
1983-01-01	40.45060000000000
1984-01-01	47.16350000000000
1985-01-01	59.84420000000000
1986-01-01	72.80740000000000
1987-01-01	81.16380000000000
1988-01-01	79.96770000000000
1989-01-01	79.31200000000000
1990-01-01	80.07200000000000
1991-01-01	80.82640000000000
1992-01-01	82.50700000000000
1993-01-01	92.76790000000000
1994-01-01	101.71500000000000
1995-01-01	94.11750000000000
1996-01-01	107.36200000000001
1997-01-01	124.32300000000000
1998-01-01	133.74700000000000
1999-01-01	155.78400000000000
2000-01-01	161.59600000000000
2001-01-01	141.91600000000000
2002-01-01	115.70100000000001
2003-01-01	108.78700000000000
2004-01-01	115.01000000000000
2005-01-01	115.95200000000001
2006-01-01	127.38700000000000
2007-01-01	129.11100000000000
2008-01-01	94.37590000000000
2009-01-01	94.00550000000000
2010-01-01	121.78700000000000
2011-01-01	118.68900000000000
2012-01-01	112.11100000000000