Below is a graph which chronicles all my submissions dating back to the early 00s until the date of this posting, but I'll come back and update it periodically.
Red dots: flat out form rejections
Yellow dot: detailed request for revise and resubmit. This like, never, happens
Orange dot: nice rejection with invitation to submit again, sometimes with personalized note
Blue: shortlisted for contest, or editors mentioned that a standard submission was shortlisted
Green: acceptance. Yay!
A few notes: magazines that never got back to me are not counted (because who knows, they might just be taking a really really long time, or perhaps they never got the submission). Contest submissions are counted as regular submissions.
Total submissions over the last decade and a half: 164. 33% of submissions receive some positive feedback (either a positive rejection, shortlisting, or publication). 3 were accepted, which means about 2% of all my submissions made it.