The handgun ban in Washington DC (called the murder capital at the time) caused a 25% drop in the homicide by gun rate and about the same in the suicide by gun rate. Homicide and suicide rates by means other than guns remained relatively unchanged during the same period.
Not only did the ban work, it also put paid to the NRA's argument that murderers would simply choose another method to kill.
Looks to me like the homicide rates from 1986 to 2005 remain unchanged. In fact, they increased through the 2000's
Filechomicidechart.svg - Wikipedia, the free encyclopedia
Not only that, but the reasons for less crime isn't solely related to gun laws as everyone would like to believe:
"As Washington neighborhoods undergo gentrification, crime has been displaced further east. Crime in Prince George's County, Maryland, has remained steady (even slightly increasing in some areas) as poorer residents move out of the city into the nearby suburbs because of rising housing costs"