Chicago Public Schools announced a 3.5% student enrollment decline for the 2016-17 school year today, for a total of 13,804 fewer students than last year. The numbers are drawn from the 10th day of attendance, a date used by CPS and the state to determine formula funding amounts for schools. Last year, student enrollment dropped by 5,588. In 2006, CPS enrolled 420,925 students, 42,444 more than this year.