Why are the placement rates so low?

[elsie]

I was just looking through this article and I was amazed at how low the placement rates were for most of the schools. Is there a reason for that? Are the jobs really not there or are there other factors? I guess what I'm asking is, "how do I avoid becoming a statistic?" I've heard that getting a library job or other related job while is school is a big plus. Is there anything else I can do to improve my chances of finding professional work after graduating?

http://www.libraryjournal.com/lj/careers/salaries/887215-305/placements__salaries_survey_2010.html.csp

Thanks so much