It varies.
When I was single in my 20s, probably 1 to 2 times per year. Once would be a virus, the 2and would be allergy induced sinus infection.
3 to 5 years ago when I was newly married, probably 5x per year. Mostly colds. Wife's toddler nephews would walk up cough in your face. Not a lot you can do at that point.
The last year, 0 times. I have more control. I work from home. I've been sober a couple of years so I don't go to crowded bars and parties. Biggest risk is the grocery, to which I return home, wash my hands, put away the food, wash my hands again, and use disinfectant wipes on all surfaces I've touched. It works, not even fleeting signs of a cold.