Of course, all those illegals are taking them.
...and a lot of people who would have normally been employed full-time except for two things.
1) The obama economy is a dismal failure with a high percentage of perennially unemployed and under employed.
2) Thanks to obamacare many people have seen their full-time jobs eliminated and cut to part-time, or seen their part-time hours cut. This necessitates having multiple part-time jobs.
The net result - which is entirely predictable - is that there is far more competition for fewer open part-time jobs. Another significant outcome, and quite probably was one of the desired outcomes, is that in numbers unemployment has gone down. They are still fudging the numbers having dropped millions from the rolls, but they're getting some help. Finally, more people, being only part-time, do not get or no-longer get health insurance coverage through their employers, thus being forced into obamacare.