The link to nationmaster needs to be read carefully. It's actually not percentages, that's deaths per 100,000 people.
They used Wikipedia's source to plug in their numbers, from this page:
Gun violence - Wikipedia, the free encyclopedia
Scroll down on wikipedia to that section, which says
Intentional Homicides (non-firearm and firearm homicides) by country
Source: United Nations Office on Drugs and Crime, 2000[8]
If you sort it by percentage of homicides with firearms, this is what you should get in descending:
NOTE that I don't think this means at all that guns are more dangerous, it's just saying that there are more homicides done with guns than there are done with other weapons.
So for the USA,
6 out of 9 people will choose a gun to murder.
That's all the statistic is trying to say.
It is important not to misinterpret the meaning of statistics, just leave them at the original intent on what they were quantifying.
I have highlighted the countries of importance:
My question for the experts..
Why does the UK rank as one of the lowest in gun deaths yet the population of the country is almost similar to that of Germany?
Here are some pop stats:
USA — Population 304,059,724 - Jul 2008 est.
Germany — Population: 82,369,552 July 2008 est.
United Kingdom — Population: 60,943,912 July 2008 est.