Year	Percent of People Ages 15 and Above
1972-01-01	39.45006
1973-01-01	39.93864
1974-01-01	40.43303
1975-01-01	40.96593
1976-01-01	41.53128
1977-01-01	42.09312
1978-01-01	42.79268
1979-01-01	43.51312
1980-01-01	44.31500
1981-01-01	45.09184
1982-01-01	45.85046
1983-01-01	46.62303
1984-01-01	47.62511
1985-01-01	48.67555
1986-01-01	49.91908
1987-01-01	50.65926
1988-01-01	51.77387
1989-01-01	52.82319
1990-01-01	55.44763
1991-01-01	56.71574
1992-01-01	57.73781
1993-01-01	58.62104
1994-01-01	59.60176
1995-01-01	61.17437
1996-01-01	62.67799
1997-01-01	63.53223
1998-01-01	64.73451
1999-01-01	65.84231
2000-01-01	66.88337
2001-01-01	68.04286
2002-01-01	68.36533
2003-01-01	72.03799
2004-01-01	72.95436
2005-01-01	73.37649
2006-01-01	72.38902
2007-01-01	72.88130
2008-01-01	73.37844
2009-01-01	73.16960
2010-01-01	74.00967
2011-01-01	74.19839
2012-01-01	74.71401
2013-01-01	75.00970
2014-01-01	75.51625
2015-01-01	76.35775
2016-01-01	76.78292