In 2015, I submitted 102 bundles of poems, comics, essays, stories, and other stuff to literary journals. 25 journals accepted my work. I received 70 rejections, and seven journals never responded. So, that's a 25% acceptance rate, the exact same as last year (weirdly).
I set my sights high this year, mostly to no avail (the New Yorker doesn't care for my comics one bit). The most exciting acceptance came from Poetry, which accepted a diagram poem in January of 2016 and published it in December. (In case you're curious: over the years I sent them almost 100 poems, drawings, and diagrams before they said yes.)
I can't crunch the numbers for a year of submitting until the year after that year, because many journals take a year to respond to submissions. So that's why I'm giving the 2015 statistics in early 2017.
Why should you care? You probably shouldn't and don't, but I started keeping track on this blog a few years ago and I'm nothing if not persistent -- as you can tell.