Line chart showing robbery rates, per 1,000 households between 1973 and 2006.

For robbery, violent crime rate per 1,000 persons began at 6.7 in 1973 and increased to 7.2 in 1974. After 1974, violent crime rate dropped to 5.9 in 1978, before increasing, reaching 7.4 in 1981. It then decreased to 2.1 in 2004, before increasing to 2.9 in 2006.