According to data recently released by the FBI, crime rates in the United States have fallen for both violent and property crimes within the past two decades. While violent crime still persists in urban areas, several of America's largest cities, such as New York, have experienced this downward trend. This decrease in crime can be attributed to a wide variety of factors, from stricter policing to community programs. Check out KQED'S The Lowdown's engaging interactive charts that compare crime levels in cities, such as America's top ten violent cities in 2012.