Original: Typically the United Kingdom suffers 450 drownings per annum or 1 per 150,000 of population whereas the United States suffers 6,500 drownings or around 1 per 50,000 of population.
Simplified: For example, in the United Kingdom there are about 450 drownings each year (that is: 1 per 150,000 of its people), and in the United States there are about 6,500 drownings (or around 1 per 50,000 of its people).