California Code, Education Code - EDC § 14022.3

(a) For purposes of calculating “increases in enrollment” pursuant to paragraph (2) or (3) of subdivision (b) of Section 8 of Article XVI of the California Constitution, the term “enrollment” for school districts, community college districts, and state agencies providing direct elementary and secondary level instructional services means the sum of the following:

(b) Any determination or computation of enrollment for purposes of this section shall be based upon actual data from prior years. For the next succeeding year, any determination or computation of enrollment for purposes of this section shall be the estimated enrollment, adjusted as actual data become available.