These crimes include murder, nonnegligent manslaughter, forcible rape, robbery, and aggravated assault. Robbery increased the most during the 10 years, by 75.6 percent, while aggravated assault increased the least, by 34.4 percent. Murder increased by 71.1 percent; forcible rape increased by 52.6 percent. The rates per 100,000 population increased steadily from 1983 to 1986, declined in 1987 and 1988, increased from 1989 through 1991, and decreased slightly in 1992. In general, the highest offense rates were in urban counties. However, in 1992, several small rural counties also had fairly high rates. Clearance rates increased from 55 percent in 1983 to 53.9 percent in 1992. In cases in which the victim-offender relationships could be determined, 80 percent of the murder victims and 90 percent of the rape victims knew their assailants. Firearms were the most frequently used type of murder and robbery weapon, with handguns the most common type of firearm. Figures and tables