Year	Percent
1975-01-01	87.7473
1976-01-01	51.7466
1977-01-01	43.9555
1978-01-01	39.5028
1979-01-01	35.9459
1980-01-01	34.3443
1981-01-01	35.3699
1982-01-01	36.8644
1983-01-01	40.0850
1984-01-01	39.5475
1985-01-01	36.6153
1986-01-01	34.8596
1987-01-01	38.6238
1988-01-01	41.1493
1989-01-01	42.9506
1990-01-01	44.4962
1991-01-01	47.0932
1992-01-01	51.4255
1993-01-01	52.3574
1994-01-01	51.6405
1995-01-01	60.4562
1996-01-01	59.6456
1997-01-01	59.4420
1998-01-01	59.5453
1999-01-01	68.1222
2000-01-01	72.3930
2001-01-01	79.9086
2002-01-01	83.0744
2003-01-01	87.2144
2004-01-01	89.3825
2005-01-01	85.8548
2006-01-01	84.0144
2007-01-01	81.8525
2008-01-01	86.3435
2009-01-01	91.0830
2010-01-01	92.3102
2011-01-01	94.2252
2012-01-01	91.3402
2013-01-01	94.1917
2014-01-01	88.5379
2015-01-01	85.7435
2016-01-01	81.4553