Here's one: Job Salary Earnings Comparison - College Degrees and High School Diploma -- You'll like this one even less. And here's one you won't like as well, either: http://www.census.gov/prod/2002pubs/p23-210.pdf -- from the U.S. Census Bureau showing $52,200.
And you know nothing about the private sector if you think the average white collar worker works anywhere close to 9 to 5.
Edit: Further, why are you linking to something that talks about household income??