Indicator #18 in the 2009-10 CMSL. The four-year graduation rate tracks students in one high school class over a four-year period and reflects the number of students who graduate on schedule after starting high school. This percentage is not the “remainder” of the Dropout Rate (CMSL Indicator #25) which accounts for the percentage of students who drop out within a single school year. Missouri defines the high school graduation rate as the number of graduates divided by grades 9-12 cohort dropouts plus graduates multiplied by 100. Illinois defines the graduation rate as the number of 2007 - 2008 graduates divided by the 9th grade enrollment in 2000 minus transfers out plus transfers in multiplied by 100. Data Source: Illinois State Board of Education (SY 2007-2008); Missouri Department of Elementary and Secondary Education (SY 2007-2008)