According to the National Self Defense Survey conducted by Florida State University criminologists in 1994, the rate of Defensive Gun Uses can be projected nationwide to approximately 2.5 million per year -- one Defensive Gun Use every 13 seconds.
Among 15.7% of gun defenders interviewed nationwide during The National Self Defense Survey, the defender believed that someone "almost certainly" would have died had the gun not been used for protection -- a life saved by a privately held gun about once every 1.3 minutes. (In another 14.2% cases, the defender believed someone "probably" would have died if the gun hadn't been used in defense.)
In 83.5% of these successful gun defenses, the attacker either threatened or used force first -- disproving the myth that having a gun available for defense wouldn't make any difference.
In 91.7% of these incidents the defensive use of a gun did not wound or kill the criminal attacker (and the gun defense wouldn't be called "newsworthy" by newspaper or TV news editors). In 64.2% of these gun-defense cases, the police learned of the defense, which means that the media could also find out and report on them if they chose to.
In 73.4% of these gun-defense incidents, the attacker was a stranger to the intended victim. (Defenses against a family member or intimate were rare -- well under 10%.) This disproves the myth that a gun kept for defense will most likely be used against a family member or someone you love.
In over half of these gun defense incidents, the defender was facing two or more attackers -- and three or more attackers in over a quarter of these cases. (No means of defense other than a firearm -- martial arts, pepper spray, or stun guns -- gives a potential victim a decent chance of getting away uninjured when facing multiple attackers.)
In 79.7% of these gun defenses, the defender used a concealable handgun. A quarter of the gun defenses occured in places away from the defender's home.
Source: "Armed Resistance to Crime: The Prevalence and Nature of Self-Defense with a Gun," by Gary Kleck and Marc Gertz, in The Journal of Criminal Law & Criminology, Northwestern University School of Law, Volume 86, Number 1, Fall, 1995