Amitabh Bachchan's confirmed Blockbusters :
Sholay (ATBB)
Muqaddar ka Sikandar (ATBB) -> Old BOI : 8.5 crores. After update : 11-12 crores
Coolie (ATBB) -> Old BOI : 9 crores. After update : Minimum 14 crores.
Mard (BB-ATBB*) -> Old BOI : 8 crores. After update : 11-12 crores.
Amar Akbar Anthony (BB)
RKAM (BB)
Parvarish (BB)
Namak Halal (BB)
Deewar (BB)
Lawaaris (BB) -> Confirmed by Koimoi's article.
Naseeb (BB)
Mohabbatein (BB)
Kabhi Khushi Kabhie Gham (BB)
Suhaag (BB)
Trishul (BB)
Potential contender :
Don
Total number of Blockbusters : 15* [And there are chances of more Blockbusters].
HGOTY (6) (Old data)
1974 - Roti Kapada aur Makaan*
1975 - Sholay
1977 - Amar Akbar Anthony
1978 - Muqaddar Ka Sikandar
1979 - Suhaag
1983 - Coolie
After update :
1974* - 1975 - 1977 - 1978 - 1979 - 1980 (Shaan, if re-runs included) - 1982 (If Sholay re-runs included and some blog claimed it was Namak Halal, but I'm not sure) - 1983 - 1985 (Mard) - 1987 (3rd re-run of Sholay).
--> Around 10 HGOTY.
(2nd and 3rd HGOTY included) :
1974* (not including RKAM, but still had a successful Majboor (12th HGOTY)) - 1975 - 1977 - 1978 (Top 3 by Amitabh Bachchan, a feat only shared by Salman Khan) - 1979 - 1980 (Ram Balram) - 1981 (Lawaaris 2nd, updated by BOI) - 1982 (Namak Halal) - 1983 - 1984 (Sharabi) - 1985 (Geeraftar) - 1986 (Akhree Raasta) - 1988 (Shahenshah) - 1990 (Aaj Ka Arjun) - 1991 (Hum) - 1992 (Khuda Gawah) - 2000 (Mohabbatein) - 2001 (Kabhi Khushi Kabhi Gham) - 2002 (Kaante) - 2005 (Bunty aur Babli).
--> 23 movies in Top 3 of the Year, otherwise 26 movies in re-runs included. On top of that, we do not have yet the complete data of many rerun movies of his. Some might have been more successful than they already were like Desh Premee that was 10th HGOTY and after reruns might have jumped 2-3 positions.
--> It signifies that Amitabh Bachchan had on average one movie in the top 3 grossers every 2/3 Years in his career that spans over 50 Years, analytically.
Apart from the first few Blockbusters, post 75, all of them were due to Stardom + Content. Of course, the one he gave during his second inning (1998-2020*) were not solely depending on him as he wasn't the n°1 Superstar that time, however, his presence did create curiosity amongst the audience and gave a boost to collections.
A unique phenomena and the only rare combination of {Megastar + Great actor}, Amitabh Bachchan !