Year	Percent
1983-01-01	19.1273
1984-01-01	17.4178
1985-01-01	17.0833
1986-01-01	17.2236
1987-01-01	14.4318
1988-01-01	14.1319
1989-01-01	16.1080
1990-01-01	17.2664
1991-01-01	18.7634
1992-01-01	20.1376
1993-01-01	21.0414
1994-01-01	23.2313
1995-01-01	26.3806
1996-01-01	28.0115
1997-01-01	32.1399
1998-01-01	36.5392
1999-01-01	38.5646
2000-01-01	37.9939
2001-01-01	41.9753
2002-01-01	43.0479
2003-01-01	43.2522
2004-01-01	43.3181
2005-01-01	45.0558
2006-01-01	45.3300
2007-01-01	43.6113
2008-01-01	43.8764
2009-01-01	54.9080
2010-01-01	65.0987
2011-01-01	60.0700
2012-01-01	55.9257
2013-01-01	53.3247
2014-01-01	55.4496
2015-01-01	56.1258
2016-01-01	56.7435