Title: Crime drop - Wikipedia
Headings: Crime drop
Crime drop
Contents
Historical context
Decline since the Middle Ages in Western Europe
Increase between the late 1950s and early 1990s
Global level
Homicide rates as comparative value
Decline since the early 1990s
Development by region
Germany
United States
Proposed explanations
Lead
Air pollution
Abortion
Drug use and demand
Economic factors
Immigration
Incarceration
Policing
Security hypothesis
See also
References
Further reading
External links

Content: Numerous attempts have been made to explain this period, but no general agreement has been reached, as some of these explanations contradict each other. Irrespective of the reason for the increase, this period appears as a relatively short deviation of the long-term decline beginning centuries ago and continuing after the early 1990s. Global level
Homicide rates as comparative value
Because of its relative unambiguousness and its small dark figures, intentional homicide is particularly amenable to long term and geographic (cross-national) comparisons. Homicide is an act that meets with virtually universal condemnation, and homicide statistics are accordingly considered to be relatively reliable and valid – both at the national level and for longitudinal and cross-national comparisons. As a readily measurable indicator, homicide is both a reasonable proxy for violent crime and a robust indicator of levels of violence within states. To bridge over remaining differences, the United Nations Office on Drugs and Crime (UNODC) developed a framework for the definition and classification of unlawful killings, both in conflict and non-conflict situations, the International Classification of Crime for Statistical Purposes (ICCS). In short, homicide is defined in ICCS as “unlawful death inflicted upon a person with the intent to cause death or serious injury”. Decline since the early 1990s
Declining trend of homicide rates from 1990 to 2017 for: Asia, Australia and New Zealand, Europe, Northern America, World
Increasing trend of homicide rates from 1990 to 2017 for: Central America, South America, declining on World level
The United Nations Office on Drugs and Crime investigates the international development of crime using homicide rates as indicator.