This study is put together by Men's Health. Seattle Pi describes that the study took into account the "percentage of households that own coffeemakers and buy coffee; household average spent on coffee; coffee shops per capita; percentage of people who drink coffee and who drink five-plus cups a day."
P.S. You gotta drink more coffee, south!
If you donate $5+, I'll send you this refrigerator magnet as a little thank you gift.