Year	Percent
1996-01-01	80.0295
1997-01-01	79.1484
1998-01-01	71.5153
1999-01-01	66.2162
2000-01-01	63.9301
2001-01-01	59.4565
2002-01-01	55.2759
2003-01-01	52.0804
2004-01-01	49.9534
2005-01-01	53.3323
2006-01-01	42.4913
2007-01-01	35.8230
2008-01-01	30.8499
2009-01-01	28.1398
2010-01-01	26.1441
2011-01-01	25.5184
2012-01-01	23.0235
2013-01-01	22.5047
2014-01-01	22.5965
2015-01-01	19.1456
2016-01-01	18.3897