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The blue line represents parents grading the system an A or B; the green line is parents who gave it a D or F.

To prove that parents — and especially poor parents — approve of the changes that Mayor Bloomberg has brought to the schools, his administration often cites data collected by a group called the Community Service Society, which every year conducts a survey of low-income families called “The Unheard Third.” The troubling thing about this data is that it doesn’t exist anywhere on the Internet. (When I referred to it earlier today, I just plucked the figures Klein cites.)

Until now! Thanks to a spokeswoman at CSS who just called me back, I’ve got the numbers from all the surveys that asked a question about the school system since 2002. They tell a story that is encouraging, but less black and white than Klein has had it. “We don’t want to paint such a rosy picture that people say, ‘Oh, everything is good,’ because it truly is not,” the spokeswoman, Tracy Mumford, told me.

The data suggest that more parents gave the school system a high A or B grade on the survey in 2007 than did so in 2002: The number is up to 35% from 22%. Less encouragingly, the percentage of families who grade the system an F, 11%, is still higher than the percentage who grade it an A, 9%, and the F percentage has been climbing since 2005. C remains the most common grade by far, and the portion of parents grading the schools a C has actually risen since 2002, by one percentage point.

The figures also suggest that the path to higher satisfaction has been bumpy, with parent upset rising to a peak in 2005 — the same year Mayor Bloomberg won re-election. The result is that while the portion of parents giving D and F grades has fallen substantially since 2005, the change since 2002 is less dramatic.

Here’s one other way to look at the figures graphically, below the jump, plus a chart showing the raw numbers:

picture-27The raw numbers:

A         B       C        D        F
2002    5%    17%    35%    17%    14%
2003    3%    22%    36%    16%    8%
2004    1%    19%    39%    14%    6%
2005    1%    17%    36%    28%    7%
2006    6%    21%    29%    14%    12%
2007    9%    26%    36%    11%    11%