Here are the stamp counts I have for the International album, but these aren't my numbers. I got these from commentators on the Big Blue website some time ago, and I can't vouch for their accuracy:
Part I - 34,410 stamps from 1840-1940,
Part II - 16,857
Part III - 14,035
Part IV - 8,621
Part V - 11,662 (through 1963)
= total
85,585 spaces from 1840-1963.
Another count has different figures, but they're fairly similar:
Part I - 34,711 stamps from 1840-1940
Part II - 17,187
Part III - 14,99
Part IV - 8,613
Part V - 20,032 (but through 1965, not 1963)
= A total of
95,534 spaces for 1840-1965 (adding two years to the count may account for most of the difference).
As for the number of stamps in the album from this point through 1984, here are estimates by decade of the number of stamps issued worldwide. Since by the 1950s, the International album generally included spaces for
all stamps issued (unlike before), these "stamps issued" figures should pretty well represent a decent approximation of the number of spaces in the album for these years:
1961-70: 55,000
1971-80: 100,000
to 1984: maybe 50,000 more?
So for 1963-84, add somewhere between 180-200,000 stamps to the previous 86-96,000 figures. That would bring the grand total in the album for 1840-1984 to about
265,000 stamps at the lower end, and about
290,000 at the higher end. That is if these figures are correct, and of course I have no way of knowing if they are.
For more accurate figures, you'd better start your own count.
