Year	Percent
1962-01-01	21.358900000000000
1963-01-01	19.244300000000000
1964-01-01	16.643100000000000
1965-01-01	15.430600000000000
1966-01-01	14.188100000000000
1967-01-01	12.808700000000000
1968-01-01	13.051500000000000
1969-01-01	13.957900000000000
1970-01-01	17.269900000000000
1971-01-01	18.800000000000000
1972-01-01	17.872700000000000
1973-01-01	20.234900000000000
1974-01-01	21.570200000000000
1975-01-01	20.306800000000000
1976-01-01	20.987400000000000
1977-01-01	24.408900000000000
1978-01-01	27.518300000000000
1979-01-01	26.743700000000000
1980-01-01	23.524300000000000
1981-01-01	22.672600000000000
1982-01-01	24.015800000000000
1983-01-01	25.469200000000000
1984-01-01	23.965600000000000
1985-01-01	22.784700000000000
1986-01-01	22.185600000000000
1987-01-01	21.592600000000000
1988-01-01	22.507300000000000
1989-01-01	22.759000000000000
1990-01-01	23.569200000000000
1991-01-01	22.894800000000000
1992-01-01	23.873100000000000
1993-01-01	22.373600000000000
1994-01-01	20.657500000000000
1995-01-01	19.958000000000000
1996-01-01	20.323400000000000
1997-01-01	20.814300000000000
1998-01-01	20.371600000000000
1999-01-01	21.191600000000000
2000-01-01	22.480999999999998
2001-01-01	23.692400000000000
2002-01-01	25.157400000000000
2003-01-01	28.131700000000000
2004-01-01	32.078900000000000
2005-01-01	32.811000000000000
2006-01-01	33.714900000000000
2007-01-01	34.510700000000000
2008-01-01	33.685300000000000
2009-01-01	34.629500000000000
2010-01-01	37.172700000000000
2011-01-01	38.579400000000000
2012-01-01	38.284600000000000
2013-01-01	40.731200000000000
2014-01-01	43.111400000000000
2015-01-01	45.517500000000000
2016-01-01	46.132500000000000