Year	Percent
1960-01-01	8.2162200000000000
1961-01-01	8.8289200000000000
1962-01-01	12.5704000000000000
1963-01-01	17.5257000000000000
1964-01-01	15.2524000000000000
1965-01-01	14.6199000000000000
1966-01-01	13.7374000000000000
1967-01-01	13.6794000000000000
1968-01-01	13.9247000000000000
1969-01-01	14.2770000000000010
1970-01-01	5.2422400000000000
1971-01-01	5.8734800000000010
1972-01-01	6.3735700000000000
1973-01-01	7.4351300000000000
1974-01-01	8.8089800000000000
1975-01-01	9.2503900000000000
1976-01-01	10.2158000000000000
1977-01-01	15.4215000000000000
1978-01-01	22.4047000000000000
1979-01-01	18.4853000000000000
1980-01-01	14.0787000000000000
1981-01-01	13.8045000000000000
1982-01-01	14.1762000000000000
1983-01-01	14.7182000000000000
1984-01-01	15.4518000000000000
1985-01-01	16.6864000000000000
1986-01-01	19.0762000000000000
1987-01-01	28.0242000000000000
1988-01-01	18.7828000000000000
1989-01-01	14.1536000000000000
1990-01-01	13.1550000000000000
1991-01-01	13.6825000000000000
1992-01-01	12.0790000000000000
1993-01-01	9.9544100000000010
1994-01-01	7.3320600000000000
1995-01-01	6.7320400000000000
1996-01-01	6.2057199999999995
1997-01-01	7.0782800000000000
1998-01-01	10.0274000000000000
1999-01-01	9.3428899999999990
2000-01-01	7.8113899999999990
2001-01-01	9.4393100000000000
2002-01-01	10.7058000000000000
2003-01-01	10.6055000000000000
2004-01-01	8.6259900000000000
2005-01-01	7.2174200000000000
2006-01-01	7.8436600000000010
2007-01-01	9.5405900000000000
2008-01-01	8.8824899999999990
2009-01-01	9.3721199999999990
2010-01-01	7.4334600000000000
2011-01-01	7.3719399999999995
2012-01-01	9.8595600000000000
2013-01-01	12.8894000000000000
2014-01-01	14.5119000000000000
2015-01-01	14.8305000000000000
2016-01-01	14.3426000000000000