Here’s a nice, concrete graph from a survey that Paul Foster took of attendees at the 2011 British New Testament Conference. What I like is that these data allow me to avoid having to say “most/many/some scholars think that Paul did/didn’t write...” in my classes. Instead I can show some hard numbers. Here is Foster’s explanation:
The survey was not rigorously scientific; only those who felt inclined returned their forms. My estimate is that approximately 70 percent of the audience participated. For each of the thirteen Pauline letters and also for Hebrews respondents were asked whether they considered each letter to be written by Paul, or not, or whether they were undecided. There were approximately 109 respondents, although two more cast an opinion only in relation to 2 Thessalonians, and one or two decided not to record their opinions in relation to the Pastoral Epistles. (p. 171)
This is limited to mostly British NT scholars, so it cannot simply be taken as representative of all NT scholars. But it certainly beats my own vague, general impression.
(Feel free to use the graphic but make sure that Paul Foster gets credit for the data collection.)