alot
There are 18 murders per 100,000 inhabitants each year. "Murders per capita" is not commonly used, as it would be of 0.00018 murders per capita.
There are 18 murders per 100,000 inhabitants each year.
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On the city proper: 3 per day (1,101 murders per year). On the extended, metropolitan area and close urban centers, 11 murders per day (3,923). You should be aware however, that population of both regions is incredibly high: 8.77 million people for Mexico City proper and over 28.23 million for the extended region.
A lot
Murder is measured by "murder rate", a statistic of intentional homicide per 100,000 people. Mexico is on the 27th place, with 10 murders per 100,000 people, or 11,200 people murdered throughout 2008. As a means of comparison, the United States is on the 48th position, with 5.4 murders per 100,000 people. However, it means 16,740 murders were committed on American soil throughout the same year.
None only people murder!
No. With only 1.7 murders per 100,000 inhabitants, it is even safer than Canada (2.1 murders per 100,000).
For the year 2005, there were 16,692 murders (about 5.6 per 100,000 people) in the United States. Very clear information at: http://www.ojp.usdoj.gov/bjs/homicide/tables/totalstab.htm
The murder rate in England and Wales for 2010 was 619
19th place with 18 murders per 100,000 inhabitants (2010).