Thank you; but the 1ml site doesn't quite hit the mark; it doesn't track utilization. But that paywall'd data is some of what I'm after, but it's still not a time-series and the period of time is not clear. I still paid for it, got 69 rows of yield per peer type of information, and below is the descriptive statistics from the set.

count  69.000000
mean    0.020715
std     0.021987
min     0.001244
25%     0.011674
50%     0.015828
75%     0.022553
max     0.178503