"Current Term Enrollment Estimates," published every December and May by the National Student Clearinghouse Research Center, include national enrollment estimates by institutional sector, state, enrollment intensity, age group, and gender. Enrollment estimates are adjusted for Clearinghouse data coverage rates by institutional sector, state, and year. As of spring 2018, postsecondary institutions actively submitting enrollment data to the Clearinghouse account for 97 percent of enrollments at U.S. Title IV, degree-granting institutions. Most institutions submit enrollment data to the Clearinghouse several times per term, resulting in highly current data. Moreover, since the Clearinghouse collects data at the student level, it is possible to report an unduplicated headcount, which avoids double-counting students who are simultaneously enrolled at multiple institutions. In spring 2018, overall postsecondary enrollments decreased 1.3 percent from the previous spring. The report shows the 12-month percentage change (fall-to-fall and spring-to-spring) for each term over the last three years. Enrollments decreased among four-year for-profit institutions (-6.8 percent), two-year public institutions (-2.0 percent), four-year private nonprofit institutions (-0.4 percent), and four-year public institutions (-0.2 percent). Taken as a whole, public sector enrollments (two-year and four-year combined) declined by 0.9 percent this spring. [For "Current Term Enrollment Estimates: Fall 2017," see ED609978.]