HAMSTERDAM THINKS GORDON RAMSAY MIGHT NOT BE GOOD AT THIS RESTAURANT THING
Grand Totals
Number of participating restaurants in seven seasons: 77
Number still open: 30 (38.86 percent)
Number that have closed: 47 (61.84 percent)
Approximate number of restaurants closed within one year of (or before) the episode air dates: 23 (29.87 percent)
http://www.grubstreet.com/2014/06/gordon-ramsay-kitchen-nightmares-restaurant-closure-rates.html