Ah, ok. I talked about both - the difference between them is not that important in big picture after all.
This article claims there were 34 ICBM's launches in 6 years - so almost 6 launches per year on average, ICBM's alone. Add SLBM's - and as i said, about 10 on average. Either way - my point is what both SLBM's and ICBM's in serivce are highly reliable, and it is wrong to question that.