Year	Percent
1960-01-01	7.2436100000000000
1961-01-01	7.1866600000000010
1962-01-01	7.2327000000000000
1963-01-01	7.7424300000000010
1964-01-01	8.8340700000000000
1965-01-01	9.1016500000000000
1966-01-01	9.3123200000000000
1967-01-01	9.5712200000000000
1968-01-01	9.8289000000000000
1969-01-01	11.2960000000000000
1970-01-01	6.8955800000000010
1971-01-01	7.2176200000000000
1972-01-01	7.3652700000000000
1973-01-01	7.2189600000000010
1974-01-01	7.6401699999999995
1975-01-01	8.5565199999999990
1976-01-01	8.9487399999999990
1977-01-01	11.1683000000000000
1978-01-01	14.4679000000000000
1979-01-01	16.1538000000000000
1980-01-01	14.6248000000000000
1981-01-01	13.2850000000000000
1982-01-01	14.7880000000000000
1983-01-01	15.6143000000000000
1984-01-01	15.4476000000000000
1985-01-01	15.9608000000000000
1986-01-01	16.1770000000000000
1987-01-01	15.9478000000000000
1988-01-01	16.7269000000000000
1989-01-01	16.1843000000000000
1990-01-01	14.9712000000000000
1991-01-01	10.9161000000000000
1992-01-01	6.9811700000000000
1993-01-01	7.2703899999999990
1994-01-01	8.1180399999999990
1995-01-01	16.5275000000000000
1996-01-01	24.2539000000000000
1997-01-01	22.6594000000000000
1998-01-01	22.8477000000000000
1999-01-01	23.5768000000000000
2000-01-01	22.8354000000000000
2001-01-01	23.2372000000000000
2002-01-01	22.7782000000000000
2003-01-01	23.2525000000000000
2004-01-01	23.7135000000000000
2005-01-01	25.5652000000000000
2006-01-01	26.7110000000000000
2007-01-01	26.5606000000000000
2008-01-01	25.5734000000000000
2009-01-01	22.1174000000000000
2010-01-01	20.8040000000000020
2011-01-01	24.2489000000000000
2012-01-01	25.1442000000000000
2013-01-01	25.7112000000000000
2014-01-01	25.3620000000000000
2015-01-01	27.9038000000000000
2016-01-01	36.7295000000000000