These statistics don't tell much.
- How many ppl have been affected in each case?
- Which timespan?
- How was the governmental system?
For example lets take us a look at Egypt with the highest percentages:
all those punishments are not accepted by the Al-Azhar University in Cairo, the world's leading Islamic learning centr:
http://www.bbc.co.uk/religion/religi...nishment.shtml
Lets take a look at stoning because of adultery. In Qur'an the punishment is lashing, some say there are some Hadiths, which indicate stoning to death.
Stoning has been the method in most of those societies before Islam. So it is more a cultural add-on than an Islamic law.
About adultery Qur'an says you need 4 honest witnesses, unless someone admits it voluntarily. Now they come and torture the woman till she admits. This has nothing to do with Islam.
The overwhelming majority of Muslims reject any kind of violence and agree that death penalty is only given by intentional murder.
In Iran where I leave the candidate of the hardliners did only get 7% in the presidential elections. And they make even less than 7% cause most liberals didn't go voting, thinking it will be manipulated anyways.
When we take a look at Europe or the USA: I don't think there are less than 7% extremists, which if under some conditions would gain power, would order death penalties for way more situations than they are shown in your statistics.
Violent behavior has deeper psychological causes and has nothing to do with Islam.