pax, agree its a superb data base and the statistics are sometimes chilling
Without tempting fate, mid-air collision is a rarety days (the 2006 GOL 737/Embraer accident being the most recent major event I can recall).
In the period you identify, mid-airs wrought havoc with regular collisions (NY City, Grand Canyon, All Nippon, PSA, Zagreb, Kurilovka, Aeromexico, Charki Dahdri. TCAS has undoubtedly made the skies safer
Having "controlled" (never eradicated) our metallurgy, engineering, flight control, CRM, mid-air collision and engine reliability issues, perhaps we are now at the cusp of a new set of threats like drones, complex electrical battery and system fires, extreme weather events, complex aircraft systems, that will need a new round of "accident learning"
Fate remains the Hunter