Year	Percent
1960-01-01	12.8461000000000000
1961-01-01	11.9748000000000000
1962-01-01	12.3373000000000000
1963-01-01	12.9568000000000000
1964-01-01	12.0450000000000000
1965-01-01	12.5524000000000000
1966-01-01	11.9007000000000000
1967-01-01	10.9864000000000000
1968-01-01	10.4635000000000000
1969-01-01	9.9567100000000010
1970-01-01	9.5997100000000000
1971-01-01	10.3494000000000000
1972-01-01	11.4323000000000000
1973-01-01	11.4853000000000000
1974-01-01	10.7610000000000000
1975-01-01	10.5771000000000000
1976-01-01	9.4657700000000000
1977-01-01	7.9833300000000005
1978-01-01	6.5723000000000000
1979-01-01	4.8972600000000000
1980-01-01	6.5870100000000000
1981-01-01	8.6578000000000000
1982-01-01	9.5164400000000000
1983-01-01	10.3435000000000000
1984-01-01	9.4072500000000000
1985-01-01	8.0955300000000000
1986-01-01	7.1158700000000000
1987-01-01	5.9093200000000000
1988-01-01	4.6719500000000000
1989-01-01	3.5304800000000003
1990-01-01	3.3644100000000000
1991-01-01	4.1557500000000000
1992-01-01	6.6123800000000000
1993-01-01	8.7167000000000000
1994-01-01	10.8911000000000000
1995-01-01	13.7063000000000000
1996-01-01	17.9996000000000000
1997-01-01	21.9557000000000000
1998-01-01	26.5349000000000000
1999-01-01	28.5241000000000000
2000-01-01	27.2900000000000000
2001-01-01	25.0808000000000000
2002-01-01	22.3398000000000000
2003-01-01	20.4107000000000000
2004-01-01	18.0955000000000000
2005-01-01	17.9326000000000000
2006-01-01	17.2527000000000000
2007-01-01	18.4757000000000000
2008-01-01	22.2642000000000000
2009-01-01	25.0285000000000000
2010-01-01	23.5931000000000000
2011-01-01	25.0480000000000020
2012-01-01	30.1871000000000000
2013-01-01	35.4457000000000000
2014-01-01	38.1978000000000000
2015-01-01	40.7631000000000000
2016-01-01	41.2034000000000000