Year	Percent
1966-01-01	0.07904500000000000
1967-01-01	0.12744200000000000
1968-01-01	0.12009600000000001
1969-01-01	0.11058699999999999
1970-01-01	0.09319600000000000
1971-01-01	0.15861300000000000
1972-01-01	0.63608599999999990
1973-01-01	0.85883999999999990
1974-01-01	1.08170000000000000
1975-01-01	2.04609000000000000
1976-01-01	3.27800999999999960
1977-01-01	5.15371000000000000
1978-01-01	5.90950000000000000
1979-01-01	6.29199000000000000
1980-01-01	7.21329000000000000
1981-01-01	8.68148000000000000
1982-01-01	11.42610000000000000
1983-01-01	14.47840000000000000
1984-01-01	18.40390000000000000
1985-01-01	20.17870000000000000
1986-01-01	19.35760000000000000
1987-01-01	21.12570000000000000
1988-01-01	20.00020000000000000
1989-01-01	22.08630000000000000
1990-01-01	21.57550000000000000
1991-01-01	20.55980000000000000
1992-01-01	21.73750000000000000
1993-01-01	38.97530000000000000
1994-01-01	45.72500000000000000
1995-01-01	40.90710000000000000
1996-01-01	38.33099999999999600
1997-01-01	38.56920000000000000
1998-01-01	37.37590000000000000
1999-01-01	37.05180000000000000
2000-01-01	38.80760000000000000
2001-01-01	41.12290000000000000
2002-01-01	43.52160000000000000
2003-01-01	42.12630000000000000
2004-01-01	42.94360000000000000
2005-01-01	43.44620000000000000
2006-01-01	48.23940000000000000
2007-01-01	54.55350000000000000
2008-01-01	54.16650000000000000
2009-01-01	87.79070000000000000
2010-01-01	80.29380000000000000
2011-01-01	75.37570000000000000
2012-01-01	89.07950000000000000
2013-01-01	89.22940000000000000
2014-01-01	85.56450000000000000
2015-01-01	96.40860000000000000
2016-01-01	89.74110000000000000