What are blu-ray statistics for movie units sold on older films?

I need statistics on how many units of the following types of (old) movies would get sold on blu-ray per year (starting from this year)?

Movies like: Titanic, Terminator 2, Jurassic Park 1, Rush Hour 1, etc? (movies that most people would have purchased on DVD probably many years ago).

I basically need to know how 're-sellable' these types of movies are when they are released on a new medium in higher quality.

Anyone got any ideas?