Year	Percent
1960-01-01	10.11940
1961-01-01	9.91173
1962-01-01	11.15760
1963-01-01	12.59420
1964-01-01	12.90280
1965-01-01	12.27040
1966-01-01	12.67580
1967-01-01	13.59540
1968-01-01	14.82680
1969-01-01	16.33500
1970-01-01	17.12650
1971-01-01	19.36420
1972-01-01	21.28570
1973-01-01	18.97120
1974-01-01	19.73780
1975-01-01	20.25850
1976-01-01	20.80420
1977-01-01	22.17490
1978-01-01	27.26590
1979-01-01	31.28760
1980-01-01	31.92600
1981-01-01	35.28140
1982-01-01	37.83250
1983-01-01	40.21110
1984-01-01	40.66190
1985-01-01	42.30890
1986-01-01	44.57940
1987-01-01	48.76410
1988-01-01	49.38290
1989-01-01	50.88030
1990-01-01	50.43960
1991-01-01	45.09840
1992-01-01	42.59930
1993-01-01	41.87970
1994-01-01	42.97960
1995-01-01	45.63340
1996-01-01	47.34220
1997-01-01	47.27590
1998-01-01	45.86330
1999-01-01	45.80120
2000-01-01	47.23870
2001-01-01	86.39930
2002-01-01	81.20530
2003-01-01	75.66390
2004-01-01	74.50680
2005-01-01	78.35690
2006-01-01	78.08970
2007-01-01	82.03600
2008-01-01	90.70210
2009-01-01	98.59760
2010-01-01	100.19900
2011-01-01	93.44770
2012-01-01	88.92420
2013-01-01	91.41970
2014-01-01	93.34560
2015-01-01	82.78780
2016-01-01	71.92830