40% isn't too far from the normal A+ distribution. Coupled with the lower incidence of negative blood types in that area, it's easy to predict that the A+ distribution would be around 15 - 25% higher than because there are very, very few negatives to dilute the A population. Plus, Norway looks to have more anyway. Japan's A+ at 40%... that's not what an anomaly is; your last 5 words are likely correct.