Year	Percent
1960-01-01	19.0221
1961-01-01	19.7164
1962-01-01	21.7532
1963-01-01	21.4692
1964-01-01	21.4844
1965-01-01	20.3088
1966-01-01	20.9969
1967-01-01	22.1122
1968-01-01	22.8552
1969-01-01	23.0262
1970-01-01	20.0093
1971-01-01	19.1830
1972-01-01	19.2439
1973-01-01	18.5662
1974-01-01	16.2094
1975-01-01	15.2004
1976-01-01	16.6271
1977-01-01	18.3288
1978-01-01	19.8004
1979-01-01	19.3370
1980-01-01	19.9054
1981-01-01	20.4925
1982-01-01	21.5969
1983-01-01	23.5971
1984-01-01	24.3889
1985-01-01	24.8644
1986-01-01	24.5714
1987-01-01	23.4662
1988-01-01	24.2046
1989-01-01	25.9896
1990-01-01	27.4464
1991-01-01	29.6782
1992-01-01	31.1633
1993-01-01	34.3032
1994-01-01	38.9191
1995-01-01	42.7200
1996-01-01	46.4215
1997-01-01	50.8061
1998-01-01	53.9100
1999-01-01	54.8627
2000-01-01	55.2888
2001-01-01	54.2242
2002-01-01	53.6754
2003-01-01	52.9400
2004-01-01	50.1867
2005-01-01	48.9971
2006-01-01	50.3891
2007-01-01	50.8769
2008-01-01	54.0059
2009-01-01	59.7980
2010-01-01	58.3961
2011-01-01	58.9524
2012-01-01	57.2970
2013-01-01	61.6481
2014-01-01	68.0664
2015-01-01	71.0369
2016-01-01	72.5689