The Guardian numbers are higher than those of the Washington Post investigation in part because they include deaths in custody and people run over by police including in routine car accidents.
The Washington Post breakdown includes threat level such as whether the deceased were attacking police and what type of weapon they were found to have been carrying, if any.
Source: Investigation: Police shootings – Washington Post.
Before you get too excited, in the aftermath of the recent Paris attacks, it was pointed out that the British police have difficulty recruiting to their armed response units because of the legal hassles involved if an armed police officer shoots anyone. There are 6000 authorised firearm officers in the UK. All 288,000 French police are armed – often with automatic weapons.
Utopia, you are standing in it! 
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