rape, robbery, assault and motor vehicle theft
1/3 is reported to the police.
Impossible to answer since (a) not all crimes are reported and (b) not all reported crime statistics are publicly available !
25%
Unknown, since all crimes are not reported. Check the FBI Uniform Crime Report for those that were reported.
UK Crime Stats for England and Wales show 512,750 reported crimes for November 2011. Many more crimes go unreported. That's about 1700 per day.
If the crimes went un-reported how could there possibly be any statistics kept on this?
Yes, that is how the majority of crimes are reported. Either by the individuals against whom the crimes were committed, or un-involved witnesses.
White-collar crimes, such as fraud and embezzlement, are less likely to be reported in victimization surveys compared to more traditional crimes like robbery or assault. This is because victims may not be aware that they have been victimized or may be reluctant to report these types of crimes due to perceived stigma or concerns about retaliation.
More than 20% are cleared by arrest.
See below link:
The three major concerns regarding the accuracy of the Uniform Crime Reporting (UCR) system are: Underreporting: Many crimes go unreported due to various reasons like fear of reprisal or lack of trust in the police. Incomplete reporting: Even if crimes are reported, not all incidents may be accurately recorded or categorized by law enforcement agencies, leading to incomplete data. Reporting bias: The UCR relies on data reported by law enforcement agencies, which can be subject to biases such as racial profiling or selective enforcement, potentially skewing the accuracy of crime statistics.
The United States' crime rate is the highest with 11,877,218 "reported" crimes annually. This may have more to do with the amount of law enforcement than with the actual number of crimes commited in per country.