This article presents 10-year trends (1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007) on some common crimes: homicide, assault, rape, robbery, car theft, domestic burglary and drug offences. In addition, a few less common offences in police statistics, such as money laundering, corruption, offences against computer data and systems are discussed, even though trends of these crimes are not available. Trends are shown from Western, Central and Eastern Europe, where significant sociopolitical changes have occurred. Although police data actually describes more the recording practices of the officials than the amount of crime, police data is highly valuable for research purposes. Most countries continuously collect information about police activity, and the police is mostly the starting point for proceeding with a case in the criminal justice system. In the USA, all common offences recorded by the police have decreased during the recent years. In Europe, property crimes, homicide and robbery have decreased in most countries, but violence and drug crimes have increased. According to the crime victim surveys, the increase in assault cannot be explained by the increasing reporting activity of victims; the increase seems real. The level of crime differs considerably in different areas: for instance, homicide is most common in Eastern Europe, but assault is much higher in Western Europe.