Earlier quoted context omitted.
States killed around 200 million people in 20th century. Does your statistics on violence include these victims?
Those numbers sound very low to me, actually.
The invidual murder rate doesn't seem to vary a lot across century: http://en.wikipedia.org/wiki/List_of_countries_by_intentiona... (judging by US), and total world population was 4 times lower in the beginning of 20th century, so I guess the "government murders : individual murders" ratio may be even bigger.
And this is not counting sick sad stuff like unfair incancernation: nazi concentration camps, gulag in the USSR, camps in North Korea(where people may spend their whole life after they are born). For example, USSR government used capital punishment several times less often than imprisonment in gulag. Of course, on average gulag is better than capital punishment, but IMO - it is still government-made violence.
In modern Russia there are a lot of people suffering because court system is fucked up: 99%+ of court verdict are convictions(<1% acquittals). Of course, not all cases get in court(some get closed before), but it is not so difficult to fake evidence. This is not an officially and centrally declared violence, but still it is violence. Regular criminals rob random people too.