The Swedish Wikipedia has 421 articles (0.4% of 102K) shorter than 70 bytes and the Danish has 351 (1.1% of 31K). As a comparison, the Dutch Wikipedia has 79 (0.08% of 89K) and the Polish has 387 (0.4% of 93K). This makes the Polish look just as bad as the Swedish, since both have 0.4% of articles shorter than 70 bytes. But perhaps a substub should be defined at 50 bytes instead? Or 100 bytes or 150?
Does this include disambiguation pages? If so, it's not a very good estimate, since they *should* be short...