How many total full service Restaurants are there Worldwide?

According to the National Restaurant Association there were 2009 US Locations: 945,000 total.

According to US Dept of Labor in 2008 39.4% are full service 8.6% drinking places. So if you apply 48% of 945,000 you get 453,600 US locations.

Maybe we can use this US number to get to WW number.