Under the heading "The Culture that is Japan", Evan Soltas posted this chart:

adding "Japan's disproportionate use of its .jp country code appears to be a digital reflection of very strong underlying cultural currents towards purity." However, several commentators jumped in to point out that this may be the result of population or GDP differences. So, I decided to run the numbers myself. I pulled the same raw data from ISC, and divided the number of domains by population and current GDP, as reported by the CIA World Factbook. Here's how the data holds up: