Statistics on Percentages of Courses Taught by Graduate Teaching Assistants Survey Report
The Conference Board of Mathematical Sciences Survey is conducted every five years. Chapter 5 of the
2010 survey report gives statistics about introductory courses. These are given by course name and type of department. They include the percentage of sections of courses taught by various types of instructors. The report can be downloaded at http://www.ams.org/profession/data/cbms-survey/cbms2010.