Year	Percent
1990-01-01	19.3189
1991-01-01	19.7886
1992-01-01	29.2228
1993-01-01	39.8794
1994-01-01	41.0360
1995-01-01	46.8147
1996-01-01	47.7836
1997-01-01	49.7780
1998-01-01	52.6751
1999-01-01	49.3384
2000-01-01	42.1502
2001-01-01	45.4415
2002-01-01	42.6059
2003-01-01	47.2056
2004-01-01	48.7063
2005-01-01	53.2912
2006-01-01	53.0264
2007-01-01	53.0620
2008-01-01	51.4513
2009-01-01	51.4796
2010-01-01	50.6874
2011-01-01	52.7279
2012-01-01	52.2530
2013-01-01	51.9926
2014-01-01	52.9483
2015-01-01	57.7787
2016-01-01	60.4457