Year	Percent
1964-01-01	8.2554300000000000
1965-01-01	6.9348300000000010
1966-01-01	6.8255200000000000
1967-01-01	7.6405500000000000
1968-01-01	10.4166000000000000
1969-01-01	8.5556300000000000
1970-01-01	5.5225500000000000
1971-01-01	5.1047000000000000
1972-01-01	5.8943100000000000
1973-01-01	6.4553800000000000
1974-01-01	6.6185100000000010
1975-01-01	6.6696100000000005
1976-01-01	7.2120100000000000
1977-01-01	7.7911000000000000
1978-01-01	9.4321800000000000
1979-01-01	8.0569600000000000
1980-01-01	7.7151000000000000
1981-01-01	8.5489600000000010
1982-01-01	9.2421600000000000
1983-01-01	9.8558800000000000
1984-01-01	12.3041000000000000
1985-01-01	11.8949000000000000
1986-01-01	12.5864000000000000
1987-01-01	10.1876000000000000
1988-01-01	11.2011000000000000
1989-01-01	10.8256000000000000
1990-01-01	10.2966000000000000
1991-01-01	10.1819000000000000
1992-01-01	11.4413000000000000
1993-01-01	12.1048000000000000
1994-01-01	11.8950000000000000
1995-01-01	12.2458000000000000
1996-01-01	12.2694000000000000
1997-01-01	12.9072000000000000
1998-01-01	13.7972000000000000
1999-01-01	14.4752000000000000
2000-01-01	16.3019000000000000
2001-01-01	16.9745000000000000
2002-01-01	19.2254000000000000
2003-01-01	19.9241000000000000
2004-01-01	21.6575000000000000
2005-01-01	24.4964000000000000
2006-01-01	28.5593000000000000
2007-01-01	31.7177000000000000
2008-01-01	33.8026000000000000
2009-01-01	36.6172000000000000
2010-01-01	39.3348000000000000
2011-01-01	44.6347000000000000
2012-01-01	42.9963000000000000
2013-01-01	42.4270000000000000
2014-01-01	43.9442000000000000