BIG STARS IN EACH DECADE
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DECADE : 1930s (Late 30s) & 1940s
1) KL SAIGAL
2) ASHOK KUMAR
3) PRITHVIRAJ KAPOOR
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DECADE : 1950s & 1960s (Early 60s)
1) DILIP KUMAR
2) RAJ KAPOOR
3) DEV ANAND
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DECADE : 1960s
1) RAJENDRA KUMAR
2) SHAMMI KAPOOR
3) SUNIL DUTT
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DECADE : 1970s,, 1980s & 1990s (Early 90s)
1) AMITABH BACHCHAN
2) DHARMENDRA
3) RAJESH KHANNA
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MODERN ERA (After 1994)
1) SHAHRUKH KHAN
2) SALMAN KHAN
3) AAMIR KHAN
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There are Total 15 Actors and 10 Actors are In All Time Great Stars.
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NOTE
Others Actors are also Big Stars But Their Popularity is Not More Than in Their Decade compare to above Mention Actors
Example -> Manoj Kumar was also Biggest Star of 70s but he has only 6 Hits but all 6 are Big Grosser He has Given Hattrick BLOCKBUSTER 1974-76 All 3 have more than 4cr Footfalls including RKAM with 5cr Footfalls but at that Time Others Actors (Rajesh,, Dharmendra ) was More Bigger than Him.
As NEW BOI said That There are Many Actors in 100 Years of Hindi Cinema who has Biggest Blockbuster or ATBB but only 7-8 Are Real Box Office Stars.