Violent crimes on Massachusetts’ transit system ­declined more than 11 percent in 2012, a decrease the MBTA attributes to stepped-up patrols and public-safety campaigns that have helped keep riders safe.

The new numbers released Tuesday by the Massachusetts Bay Transportation Authority show that violent crimes dropped from 1,159 in 2011 to 1,029 incidents last year. There were no homicides, two rapes, and 12 burglaries reported on the MBTA in 2012, the new ­data show. The sole homicide in 2011 includes was that of a 19-year-old man who was fatally shot at the Savin Hill station on the Red Line.