Year	Percent
1989-01-01	26.8271
1990-01-01	21.6998
1991-01-01	29.6614
1992-01-01	34.8264
1993-01-01	41.7415
1994-01-01	39.0349
1995-01-01	33.8354
1996-01-01	32.6506
1997-01-01	19.6294
1998-01-01	26.6479
1999-01-01	27.0732
2000-01-01	24.7253
2001-01-01	30.6287
2002-01-01	33.2249
2003-01-01	35.7711
2004-01-01	37.1000
2005-01-01	38.0217
2006-01-01	35.0462
2007-01-01	34.5443
2008-01-01	28.5277
2009-01-01	31.0911
2010-01-01	30.5885
2011-01-01	28.7986
2012-01-01	33.5011
2013-01-01	30.2816
2014-01-01	29.8256
2015-01-01	28.1911
2016-01-01	25.6522