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Missing values
indicate an area was not
available in a
given year.
Scores are
averages based
on the
performance of
graduating
seniors in each
of the years
shown.
Average scores
typically do not
equal 500
because each
year's scores
are based on a
cumulative
reference group
made up of the
previous six
years'
graduates. The
composition and
performance of
the reference
groups differ
somewhat from
year to year.
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