The United Nations Office on Drugs and Crime (UNODC) regularly publishes extensive statistics on crime as well.
https://www.unodc.org/unodc/en/data-and-analysis/crime-and-criminal-justice.html
UNODC's responsibility is to collect data for crime and criminal justice statistics in order to make policy-relevant information and analyses available to the international community in a timely manner. The office also aims to enhance the cross-national comparability of data through the development of key indicators and data reporting tools. Periodic reports on selected crime issues provide in-depth analysis on key topics that are currently of concern at the global and regional level. For brief statistics accompanied by concise analytical depictions that illustrate selected topics based on the latest available data, please refer to: -> https://www.unodc.org/unodc/en/data-and-analysis/data-matters.html
This series entitled DATA MATTERS offers short, easy-to-read research reports in order to make UNODC data accessible to policy-makers and the general public in a timely manner. The spirit of the series is to focus on the essential and to let the data speak for themselves. UNODC also works on developing standards for national crime and criminal justice information systems as well as standards for surveys on unreported and unrecorded crime, for example by means of victim interviews. -> https://www.unodc.org/unodc/en/data-and-analysis/standards-and-manuals.html
Beyond statistical aspects, explicit reference is made to the Manual on Victimization Surveys and the MANUAL ON CORRUPTION SURVEYS - Methodological guidelines on the measurement of bribery and other forms of corruption through sample surveys. The comprehensive presentation of all issues that have to be considered when planning and carrying out research into unreported and unrecorded crime is vital with regard to an international comparison of crime. The manuals will be largely beneficial especially to countries where unreported and unrecorded crime has not yet been examined.