Bankruptcies normally impact whole families. So 530,000 bankruptcies could easily be 4,000,000 people impacted, per year. Over the last 20 years that is over 20% of the population.
Or they could all be single people who went bankrupt because they gambled away all of their money, but they list medical bills as a contributing factor because their bankruptcy filing included a $20 copay for treating their gambler's elbow. See, I can make up stuff too.