Year	Number of Years
2006-01-01	74.7097560975610
2007-01-01	75.3634146341464
2008-01-01	75.3097560975610
2009-01-01	76.1560975609756
2011-01-01	77.4731707317073
2014-01-01	77.8243902439025
2016-01-01	77.8731707317073