Year	Percent
1960-01-01	22.86150000000000
1961-01-01	20.51370000000000
1962-01-01	19.74390000000000
1963-01-01	17.95860000000000
1964-01-01	24.55520000000000
1965-01-01	22.17980000000000
1966-01-01	22.34130000000000
1967-01-01	22.87680000000000
1968-01-01	24.32600000000000
1969-01-01	24.34530000000000
1970-01-01	21.70150000000000
1971-01-01	23.87940000000000
1972-01-01	26.38080000000000
1973-01-01	27.38550000000000
1974-01-01	33.77830000000000
1975-01-01	40.98890000000000
1976-01-01	33.05900000000000
1977-01-01	30.76180000000000
1978-01-01	31.29740000000000
1979-01-01	29.94760000000000
1980-01-01	32.04880000000000
1981-01-01	32.38100000000000
1982-01-01	32.27230000000000
1983-01-01	33.41190000000000
1984-01-01	34.90310000000000
1985-01-01	38.56960000000000
1986-01-01	43.36900000000000
1987-01-01	46.36620000000000
1988-01-01	49.76120000000000
1989-01-01	51.70800000000000
1990-01-01	52.38570000000000
1991-01-01	55.02040000000000
1992-01-01	58.29850000000000
1993-01-01	58.77950000000000
1994-01-01	59.66320000000000
1995-01-01	62.84310000000000
1996-01-01	66.66530000000000
1997-01-01	68.58960000000000
1998-01-01	67.87380000000000
1999-01-01	69.45760000000000
2000-01-01	69.22250000000000
2001-01-01	69.68800000000000
2002-01-01	72.87760000000000
2003-01-01	76.54000000000000
2004-01-01	83.03670000000000
2005-01-01	88.60820000000000
2006-01-01	87.15520000000000
2007-01-01	85.03430000000000
2008-01-01	88.96170000000000
2009-01-01	92.29920000000000
2010-01-01	90.23120000000000
2011-01-01	89.66340000000000
2012-01-01	90.21190000000000
2013-01-01	90.35670000000000
2014-01-01	92.87799999999999
2015-01-01	96.24090000000000
2016-01-01	98.56020000000000