The spread of the conceptual approach to teaching physics broadened the range of students taking physics in high school. Enrollment in conceptual physics courses in high school grew from 25,000 students in 1987 to over 400,000 in 2009. In 2009, 37% of students took high school physics, and 31% of them were in Physics First, conceptual physics courses, or regular physics courses using a conceptual textbook.