"Never" is a strong word, but you're welcome to read the English-language reports of Japanese lenders which break this out for their consumer businesses. Factors which generally tend to depress it include low revolving credit use, relatively high underwriting standards for credit (not solely a positive thing—ask your favorite Japan-resident foreigner for stories sometime), formal or informal risk transfer, outsourcing collections to the yakuza by policy [0], etc.

[0] I feel it necessary to say "I am not making this up. It happened at first-rate financial institutions many times within the last 20 years."