I have always been curious about BOMs list of inflation-adjusted list having GWTW as number 1. With something like a 2.5 yr initial run and 7-8 re-releases. As others have said, tracking number of tickets sold would make this so much easier. I agree too that there has to be some control for US population. Also, in the best of all worlds, not just number of days in release/re-release but number of theaters/theatrical engagements (The-Numbers has some of this data - but not for GWTW). This string is very useful - assuming the data retrieved is reasonably accurate. I will freely admit that my interest in this topic has been to prove that Star Wars IV has been and still is #1 (hey - I was a 9 year old boy in 1977, what do you expect). This is what I come up with using GWTW numbers from this string and data gotten from other sites for the rest:
Total tickets sold (including re-releases) Tickets sold (initial run only) Percent of US population buying ticket (initial run only)
1. Star Wars IV (173,403,304) 1. Star Wars IV (133,592,981) 1. Star Wars IV - 61%
2. GWTW (157,400,000) 2. Titanic (128,923,348) 2. GWTW - 57%
3. Titanic (137,329,646) 3. Avatar (99,968,820) 3. Titanic - 48%
4. Avatar (100,705,547) 4. GWTW (76,000,000) 4. Avatar - 33%
# tickets per theatrical engagement
1. Star Wars IV - 3969
2. Avatar - 2207
3. Titanic - 1575
For comparison, Star Wars VII: 99,788,705 tickets so far in first 29 days (that is 31% of current US population). Eventually it will be 4th in total tickets, 3rd in initial run and probably just inch out Avatar for % population buying ticket to take 3rd in that category too. If it has a typical run for current blockbusters of 160 days (2012-2015 era movies) that will be about 36,000 theatrical engagements. I expect about $930,000,000 (128,900,000 tickets) when it is done. That would be 3581 tickets per theatrical engagement - #2 on that list.
May the Force be with you.