First-Term Members of the House of Representatives and Senate, 64th - 114th Congresses [March 7, 2016] [open pdf - 782KB]
"This report provides summary data on the number of Senators and Members of the House of Representatives who first entered Congress between the 64th Congress (1915-1917) and the 114th Congress (2015-2016). First-term membership is divided into two broad categories in each chamber: Members chosen prior to the convening of a Congress, and those chosen after a Congress convenes. The resulting data, combining pre-convening and post-convening first-term Members, provide a count of all Members who served a first term in the House or Senate."
CRS Report for Congress, R41283
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html