what is the market share of DVD rental companies (like Blockbuster &
Netflix etc), at least those that have more than %8 of the market.
I want to know U.S. and World Wide

an answer should be somthing like that:

1. In the U.S. for X DVD rentals in 2003:
x1% were rented from blockbuster
x2% from <otherBugCompany>
..
..
x5% from Netflix
%x6 from Other companies

2. Over the world from Y DVD rental in 2003(or later)
y1% were rented from <company1>
...
...
...
y5% were rented from <company6>
..
y8% were rented by all other companies together 

Remark: Only DVD rentals without VHS !