What is the average number of customers that visit an average grocery
store in a year?

My grocery store is pretty average...

I am a cashier and I get 500 customers a week.
There are 12 cashiers all of which get roughly 500 customers a week or 100 a day.
That is 6,000 customers a week but we also have self checkouts and
they get about 35% of the customers. So thats about 3,200 customers a
week.  So total that is 9,200 customers a week.
There are 53 weeks in a year so an average grocery store gets 487,600
customers a year.