I wanted to see where the United States fit into this so I looked it up. It differs from what you said. here is the information...
#1 Italy: 54 litres
#2 France: 47 litres
#3 Switzerland: 42 litres
#4 Austria: 36 litres
#5 Denmark: 32 litres
#6 Belgium: 30 litres
#7 Germany: 26 litres
#8 Australia: 21 litres
#9 United Kingdom: 20 litres
#10 Netherlands: 20 litres
#11 New Zealand: 19 litres
#12 Sweden: 16 litres
#13 Ireland: 13 litres
#14 Norway: 11 litres
#15 Japan: 10 litres
#16 Canada: 10 litres
#17 Finland: 10 litres
#18 United States: 7 litres
Weighted average: 23.6 litres
This is from http://www.nationmaster.com/graph/foo_win_con-food-wine-consumption