So far 9 refresh(until 400 crystal) on my main acc and got 21 blueprints.
And 6 refresh(until 200 crystal) on my alt acc and got 20 blueprints .
So on this sample, 1800 energy from refreshes and 500-600 energy from daily bonuses and accumulation used.
1800+550 = 2350 energy ->41 bluprints
so 41/2350 = %1,7 drop rate so far.
Wanted to do the math for people wondering the drop rate. However, I would still use refreshes even if drop rate were lower, as GET2 is so valuable for us who haven't been playing for longer. So appreciate the idea of increasing the number of these kind of galactic chases.