You are wrong!
http://en.wikipedia.org/wiki/International_Security_Assistance_Force#NATO_nations
In alphabetical order: Albania, Belgium, Bulgaria, Canada, Croatia, Czech Republic, Denmark, Estonia, France, Germany, Greece, Hungary, Iceland, Italy, Lativa, Lithuania, Luxembourg, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Turkey, United Kingdom, United States.
US: 1750-2155 deaths, 330,000,000 people
UK: 448/63 million
Canada: 157/33 million
The back of my envelope says the UK took the highest ratio of deaths to population. US and Canada were next in line. For comparison Germany, with 80 million people, took 57 killed. Far less than the UK with 63 million people. Either the Germans were highly skilled at not getting killed, or they were not involved in heavy combat like the other three countries cited.
Remember for most of these countries ISAF stood for I Saw Americans Fight.
Ukraine also provided combat troops to our fight in Iraq and Afghanistan as well.
#48: Every one is a NATO member.