Year	Percent
1986-01-01	50.2526729286902
1987-01-01	51.9571221098208
1988-01-01	53.6434217954694
1989-01-01	56.4689442805420
1990-01-01	56.3205831668829
1991-01-01	56.1210301343023
1992-01-01	55.5440102555184
1993-01-01	52.8899862770133
1994-01-01	50.5023929471800
1995-01-01	48.0821525379869
1996-01-01	44.3354223282611
1997-01-01	43.3846218835496
1998-01-01	41.8933047274504
1999-01-01	40.3897896552533
2000-01-01	40.3542190104307
2001-01-01	37.3902180529716
2002-01-01	34.6468837614852
2003-01-01	33.2650106316133
2004-01-01	31.2472793201412
2005-01-01	29.1488410722128
2006-01-01	28.5147276430776
2007-01-01	27.1478720772992
2008-01-01	26.9185101762363
2009-01-01	25.6885838014363
2010-01-01	24.3350291591947
2011-01-01	24.0687333562968
2012-01-01	23.2764037135146
2013-01-01	22.8511976485055
2014-01-01	21.4861971759823
2015-01-01	22.1875270438684
2016-01-01	21.4209281258902
2017-01-01	19.5167135806125