In Sweden, we were at some point running out of numbers as when there were an unprecedented number of applicants due to the immigration a while back. Someone w

In Sweden, we were at some point running out of numbers as when there were an unprecedented number of applicants due to the immigration a while back. Someone was interviewed on the subject and said that if they built the system today, they would totally go for randomly generated number sequences rather than relying on a system based on birth date etc.