Data and graph here.
The all-time high in this metric was reached on 9-1-10 when 9.25 million were part-time for economic reasons.
The most current reading puts 7.98 million part-time.
It was in late 2008 when the measure reached above 7 million for the first time, and the lowest below 8 million we've fallen since 2009 was in March 2012 when 7.58 million were part-time.
