you are correct, that's not a lot... but these are statistics. PER CAPITA means the figure is averaged out over the entire population of Russia, including non drinkers, little old ladies, children etc....
IE, the hardcore Russian drinker consumes vastly more than that figure
There are more hardcore drinkers per capita in russia which raises the PER CAPITA consumption figure to more then 3X (EDIT: typo,,, it's 2X ) the north American equivalent
If there were a reliable way to translate that statistic to the individual russian rubby, the figure would be shocking (like more than a 40oz of vodka per day - same as a real hardcore rubby over here... there are just many more of them over there).