In order of highest to lowest, here's the % of psychopaths in the various countries listed (country's population listed in parentheses, all from wiki):
Low Countries (in past; populations went to USA and South Africa): >42
Isreal: 42 (pop. 7,465,000)
USA: 23 (pop. 308,586,000)
Russia: 17 (pop. 141,927,297)
UK: 14 (pop. 61,113,205)
Holland: 13 (pop. 6,065,459)
France: 10 (pop. 65,447,374)
Ethiopia: 3 (pop. 79,221,000)
Spain: 2.6 (pop. 46,661,950)
China: 0.9 (pop. 1,338,612,968)
Samoa: 0.6 (pop. 179,000)
If you add all the populations of these countries you get 2,055,279,253 (feel free to check my math, it might be wrong). If you divide the respective numbers of psychopaths into this number you get a number of 6.3%. This is assuming that the numbers apply to the percentage of the given populations and not the percentage of global psychopaths (the numbers seem to suggest the former, as they add up to more than 100). This number could be inaccurate for the total world population, which is 6,799,700,000. Most of Africa's 1,000,010,000 people aren't included, as well as South America's 385,742,554. There are also another 2.6 billion in Asia. Based on the low numbers for China and Ethiopia, I'd guess Africa and Asia would be lower on the whole than the rest of the world, which could bring the total average down.
A little bit about Samoan culture from wiki:
The fa'a Samoa, or traditional Samoan way, remains a strong force in Samoan life and politics. Despite centuries of European influence, Samoa maintains its historical customs, social and political systems, and language.
Samoan mythology include many gods with creation stories and figures of legend such as Tagaloa and the goddess of war Nafanua, the daughter of Saveasi'uleo, ruler of the spirit realm Pulotu. Other legends include the well known story of Sina and the Eel which explains the origins of the first coconut tree.
Samoans are deeply spiritual and religious people, and have subtly adapted the dominant religion of Christianity to 'fit in' with fa'a Samoa and vice versa. As such, ancient beliefs continue to co-exist side-by-side with Christianity, particularly in regard to the traditional customs and rituals of fa'a Samoa. The Samoan culture is centered around the principle of vāfealoa'i, the relationships between people. These relationships are based on respect, or fa'aaloalo. When Christianity was introduced in Samoa, most Samoan people converted. Currently 98% of the population identify themselves as Christian. The other 2 percent either identify themselves as irreligious, or do not belong to any congregation.
Pe'a Samoan male tattoo
The Samoans have a communal way of life with little privacy. They do almost all their activities collectively. An example of this are the traditional Samoan fales (houses) which are open with no walls, using blinds made of coconut palm fronds during the night or bad weather.
As with other main Polynesian cultures Hawai'ian, Tahitian and Māori with significant and unique tattoos, Samoans have two gender specific and culturally significant tattoos. For males, it is called the Pe'a and consists of intricate and geometrical patterns tattooed that cover areas from the knees up towards the ribs. A male who possesses such a tatau is called a soga'imiti. A Samoan girl or teine is given a malu, which covers the area from just below her knees to her upper thighs.[33]
The Samoan word for dance is Siva with unique gentle movements of the body in time to music and which tells a story, although the Samoan male dances can be more physical and snappy.[34] The "Sasa" is also a traditional Samoan dance, in which rows of dancers perform rapid synchronised movements in time to the rhythmn of wooden drums or rolled mats. Another dance, performed by males is called the Fa'ataupati or the slap dance, creating rhythmic sounds by slapping different parts of the body. This is believed to have been derived from slapping insects on the body.
The form and construction of traditional architecture of Samoa was a specialised skill by Tufuga fai fale that also linked to other cultural artforms.