Hard to say the number because it is difficult (but sometimes not impossible) to deduce the device from on chain data. ASICs do exist but they have not obsoleted GPUs like has happened on other projects (such as Bitcoin.)

FPGAs were never big for mining. There was like 3 months in early Bitcoin where they people seriously tried deploying them but the simple fact is they are way too expensive from manufacturer markup for mining. And if you want to make your own you’ll just end up making an ASIC instead.