I went through all of Roger Ebert's Top Ten lists he put out each year from the 1967 until his death.
Read them here: http://www.rogerebert.com/rogers-journal/eberts-10-best-lists-1967-present
Not surprisingly, the older the list, the more movies I had seen from it.
I haven't seen any of the movies on the lists from 2002, 2003, 2005 and 2006.
Saw one on 2007's list, one from 2004, two from 2001.
I saw eight from 1967, seven from 1968, six from 1969, six from 1970.
1979, I saw all ten.
I saw only four of his "Best Films of the 1980s", but seven of the "Best Films of the 1990s".
Ebert tended to give things more stars than they deserved. Especially Lone Wolf McQuade. But it's subjective anyway and you just have to know what you're reading.