Year-by-year for me:
< 2016: 0
2016: 1 (Corridor H)
2017: 0
2018: 1 (Golden Spike)
2019: 0
2020: 0
2021: 0
2022: 1 (Philly)
2023: 1 (so far) (History of US1/US40 in Harford County, MD)
Grand total: 4. Average per year: 0.5.
It's tough for me since my wife isn't really a roadgeek, and so I always end up going alone and feeling guilty about leaving her behind, ESPECIALLY over two-day meets. Also, I usually don't have the funds and/or available time off from work to travel, so I end up sticking VERY close to home. (When I did Corridor H, I lived in Maryland. In 2018, I started working in the Philly area and commuting weekly from Maryland, which put a huge damper on ALL of my hobbies, but Golden Spike was too rare an opportunity to pass up. I moved to Philly in late 2021.)