Year	Percent
1970-01-01	85.93029879
1971-01-01	93.13742709
1972-01-01	84.77528632
1973-01-01	86.14942461
1974-01-01	108.60019050
1975-01-01	103.41549080
1976-01-01	95.77658005
1977-01-01	93.03891935
1978-01-01	89.12595447
1979-01-01	92.23578633
1980-01-01	112.63550630
1981-01-01	98.33503734
1982-01-01	85.60383216
1983-01-01	77.11963801
1984-01-01	67.74978661
1985-01-01	55.01261347
1986-01-01	46.47208924
1987-01-01	40.46378322
1988-01-01	38.19258506
1989-01-01	48.98822140
1990-01-01	41.57383305
1991-01-01	28.75827257
1992-01-01	19.87547573
1993-01-01	202.52252260
1994-01-01	193.11802720
1995-01-01	156.20905090
1996-01-01	116.22960890
1997-01-01	98.85310153
1998-01-01	74.47137690
1999-01-01	111.48602710
2000-01-01	112.51292130
2001-01-01	136.24484040
2002-01-01	87.68678473
2003-01-01	98.83522319
2004-01-01	126.69938040
2005-01-01	122.05746020
2006-01-01	116.93394870
2007-01-01	117.22170260
2008-01-01	118.92361420
2009-01-01	99.98759572
2010-01-01	112.58772110