I believe last year was a benchmarking year, so the data in CA were probably not as complete (and likely capped at the high end). This is the SBAC benchmarking document:
http://www.smarterbalanced.org/assessments/scores/You might be able to get an approximation of percentiles by using the X & SDs in the first table of this document, taken from the field test data. (Calculate the number of SDs +/- the mean, and then look up the corresponding percentile in any table of normal distributions.):
http://www.smarterbalanced.org/wp-content/uploads/2015/08/Disaggregated-FieldTestDataFINAL.pdf
