It may refer to the following: http://www.usatoday.com/story/money/business/2013/04/07/march-labor-force-participation/2057887/the following
"The portion of Americans working and looking for work fell in March to 63.3% from 63.5%, lowest since 1979"
Since "a portion of" is not the same as "the number of", the claim is not true, but may be based on a related true claim.
