Well unless you are playing like in GM level, you can do just fine with around 70 APM.
APM is not a measure of skill... When you look at SC pros spamming clicks like crazy , it's not because they are actually doing something with them, most of the clicks are overall just empty hits that do nothing, but it keeps them warmed up so in the case that they do need to micro something, they can do it faster than other people.
That's effective APM vs overall APM.
Ever see MKP marine split? vs bane balls.. its a sight to see..
But I can say from personal experience that D3-1 your apm starts getting past 150 and peaking at 200 during intense moments. Or at least that's how it was for me playing Terran.