Also the 47044 could refer to the certified copy number and not to the number on the birth certificate.
That is what I’m thinking: It is the 47,044th Certificate Copy of Registration of Birth issued since 10 December 1963. I researched it and found it consistent with the rate of population growth during that time. Subtract natural deaths, add in high infant mortality rate incl. some registered births, and subtract non-registered births and the number is still consistent.