Year	Percent
1960-01-01	9.3000800000000000
1961-01-01	9.6384800000000000
1962-01-01	10.2669000000000000
1963-01-01	11.0335000000000000
1964-01-01	12.4383000000000000
1965-01-01	12.7594000000000000
1966-01-01	14.1465000000000000
1967-01-01	14.5359000000000000
1968-01-01	14.3011000000000000
1969-01-01	14.2906000000000000
1970-01-01	14.4077000000000000
1971-01-01	15.3109000000000000
1972-01-01	13.7827000000000000
1973-01-01	12.0308000000000000
1974-01-01	11.9195000000000000
1975-01-01	12.4812000000000000
1976-01-01	14.6491000000000000
1977-01-01	17.3512000000000000
1978-01-01	17.8812000000000000
1979-01-01	15.9361000000000000
1980-01-01	16.1226000000000000
1981-01-01	18.6115000000000000
1982-01-01	14.4189000000000000
1983-01-01	12.8284000000000000
1984-01-01	7.4791000000000000
1985-01-01	5.4054699999999990
1986-01-01	7.9229899999999995
1987-01-01	13.5562000000000000
1988-01-01	16.9255000000000000
1989-01-01	17.3707000000000000
1990-01-01	19.5843000000000000
1991-01-01	25.0935000000000000
1992-01-01	30.7936000000000000
1993-01-01	36.7174000000000000
1994-01-01	41.3623000000000000
1995-01-01	40.7969000000000000
1996-01-01	44.1973000000000000
1997-01-01	49.7817000000000000
1998-01-01	52.4322000000000000
1999-01-01	54.2630000000000050
2000-01-01	52.1889000000000000
2001-01-01	55.0066000000000000
2002-01-01	54.9803000000000000
2003-01-01	52.6422000000000000
2004-01-01	48.1256000000000000
2005-01-01	44.5766000000000000
2006-01-01	43.6380000000000050
2007-01-01	48.7364000000000000
2008-01-01	53.0910000000000000
2009-01-01	53.3828000000000000
2010-01-01	46.3947000000000000
2011-01-01	46.9004000000000000
2012-01-01	51.2309000000000000
2013-01-01	55.3822000000000000
2014-01-01	60.5746000000000000
2015-01-01	69.8574000000000000
2016-01-01	72.6313000000000000