I have a table with city and population. I want to run a random based in population

I have a city table with: "name" and "population". I want to select randomly a city, but based in the population.

New York - 19.000.000 City 2 - 1.000.000

So randomly I have 19X more chance to get "New York" than "City 2".

Of course this table has much more cities.