Year	Percent
1960-01-01	54.43645
1961-01-01	56.97538
1962-01-01	60.96386
1963-01-01	65.35519
1964-01-01	72.83176
1965-01-01	72.81554
1966-01-01	70.65421
1967-01-01	67.49792
1968-01-01	67.81609
1969-01-01	70.12696
1970-01-01	73.75256
1971-01-01	75.49313
1972-01-01	88.68097
1973-01-01	91.69274
1974-01-01	95.98021
1975-01-01	90.46783
1976-01-01	93.16148
1977-01-01	94.97827
1978-01-01	94.61911
1979-01-01	99.98134
1980-01-01	98.72966
1981-01-01	97.93608
1982-01-01	105.46330
1983-01-01	112.63290
1984-01-01	120.46030
1985-01-01	123.36210
1986-01-01	189.62130
1987-01-01	116.59250
1988-01-01	123.64630
1989-01-01	127.49200
1990-01-01	127.16990
1991-01-01	128.54820
1992-01-01	188.91840
1993-01-01	186.76280
1994-01-01	182.78410
1995-01-01	168.06320
1996-01-01	160.79880
1997-01-01	135.89190
1998-01-01	132.94760
1999-01-01	119.95310
2000-01-01	123.72240
2001-01-01	124.15020
2002-01-01	127.85010
2003-01-01	127.79360
2004-01-01	129.15580
2005-01-01	125.07180
2006-01-01	123.93290
2007-01-01	124.58880
2008-01-01	125.24160
2009-01-01	125.85190