Movie Ratings - Mine on IMDB

I actually thought I'd rated over 4,000 films on IMDB.com but the actual total is just under 3,650.  The question posed to me last night by a good friend was "how many have you given a rating of 10?"

So I checked.  Here is the list:

To Live (1994)
Hoop Dreams (1994)
Eat Drink Man Woman (1994)
(funny how the first three the site listed as my top rated films were all from one year)
The Bridge on the River Kwai (1957)
Star Wars (1977)
The Godfather (1972)
Leon: The Professional (1994)
The Godfather, Part II (1974)
Casablanca (1942)
Citizen Kane (1941)
Full Metal Jacket (1987)
Lawrence of Arabia (1962)
Crouching Tiger, Hidden Dragon (2000)

That was it.  At the time I was asked, I estimated that I'd given out between 20 and 30 ratings of 10.  Guess I was overestimating.  But the problem with this kind of rating system is why the top rated film on IMDB remains The Shawshank Redemption.  Is that the best movie ever?  Apparently in the minds of the total IMDB registered user base, it is.  How can that be?

You tell me.