Metrics, schmetrics. One could look at the civilian employed/population ratio. Regardless of whether people want a job (which is determined in part by how hard it is to find one and what the competing alternatives are), this probably better measures a good bit about how the burden of supporting the economy is shared, and thus how easy it is to support the economy (ex capital asset growth, net exports, other stuff.)
And no it doesn't measure hours worked, hourly earnings, part time/full time or anything like that.
And I didn't put the Y-axis origin at 54%, the St Loius Fed did--call them lairs with stats not me
http://www.internationalskeptics.com/forums/imagehosting/127464f3058928005a.jpg
http://research.stlouisfed.org/fred2/series/EMRATIO