Percentage of Acceptances versus Number of Pieces Submitted

My friend Al has stopped submitting to journals because he finds it a waste of time, given that an acceptance comes to him so rarely--he says it's about 1 percent. So I decided to look at my own rates to see if they were comparable. I was thinking they were about 2 percent, at least in recent years.

So first, let's look at the percentages, with and without poetry (it used to be stories were harder for me to find publication for, whereas in the most recent year it has become just the opposite):
I had a long dry spell in the early 2000s. But I also didn't submit much until about 2008, when I decided no longer to limit myself to my best seven pieces--instead, I would send out the best forty pieces or so (I don't do simultaneous submissions). So the percentages have gone up, I suppose, because I'm doing more submitting, but they've also gone down from times when I actually did receive the rare acceptances. Overall, Al turns out to be correct, however: the general acceptance rate is one in one hundred.