This takes you to the WA SoS office which publishes these statistics. https://www.sos.wa.gov/elections/research/ballot-return-statistics.aspx
Thanks, DoubleNickle. The birthdate in my voter registration info appears to be tallied up by the SoS minions.
Nevertheless, I remain suspicious of the mail-in process, and agree with Josef Stalin’s comment that it doesn’t matter how many voters vote. What really matter is who counts the votes.