Best selling fiction books of all times

I was curious about the best selling fiction books of all times and did some research. Most listings on the Internet were from the book Top 10 of Everything by Russell Ash. Of course these are only best guesses since there are no perfect book sale records. Yet a safe guess is that these books sold at least 10,000,000 copies. Here goes the list:

• Jonathan Livingston Seagull by Richard Bach
  
• The Exorcist by William Blatty
• Jaws by Peter Benchley
• God's Little Acre by Erskine Caldwell
• Catch-22 by Joseph Heller
• To Kill a Mockingbird by Harper Lee
• The Thorn Birds by Colleen McCullough
• Peyton Place by Grace Metalious
• Gone with the Wind Margaret Mitchell
• 1984, Animal Farm by George Orwell
• The Godfather by Mario Puzo
• The Carpetbaggers by Harold Robbins
• The Catcher in the Rye by J. D. Salinger
  

What surprised me was that there were a few books in the list I never every heard of; like The Thorn Birds (1977), Peyton Place (1954) and The Carpetbaggers (1961). I guess these books were not saying something of timeless worth but they were capturing something crucial for their times. For example Peyton Place is about three women who came to terms with their identities as sexual beings.