POP (the book of books) has that number for certain dates based on 1900- you should be able to use that (I checked it has 1.1. 1972) and the value for two years ....
Martin
POP (the book of books) has that number for certain dates based on 1900- you should be able to use that (I checked it has 1.1. 1972) and the value for two years ....
Martin