A list of the top 11 countries with the largest average breast sizes and with the average BMI (in the brackets) as well so you can find the country with the most slim-n-busty girls!

#1 United States – C (29.0)
#2 United Kingdom – C (27.1)
#3 Venezuela – B-C (26.9)
#4 Colombia – B-C (26.7)
#5 Sweden – B-C (25.4)
#6 Netherlands – B-C (25.3)
#7 Canada – B-C (26.7)
#8 Georgia – B (27.7)
#9 Australia – B (26.8)
#10 Bosnia and Herzegovina – B (25.3)
#11 Switzerland – B (23.8)

Notes: Breast size correlates closely with overall BMI. Also notable is the fact that this data set does not include every country in the world.

Overall, the largest breast sizes are concentrated in Europe and the United States. The smallest breast sizes are concentrated in African and southeast Asian countries. Experts suggest this is due largely to both genetics, as the women in these regions tend to be smaller overall, and to the fact that the women of these areas often live more active lifestyles, which can decrease both body mass and breast size. Source