According to statistics gathered by the National Abortion Federation (NAF), an organization of abortion providers, since 1977 in the United States and Canada, there have been 17 attempted murders, 383 death threats, 153 incidents of assault or battery, 13 wounded, 100 butyric acid stink bomb attacks, 373 physical invasions, 41 bombings, 655 anthrax threats, and 3 kidnappings committed against abortion providers. Between 1977 and 1990, 77 death threats were made, with 250 made between 1991 and 1999. Attempted murders in the U.S. included: in 1985 45% of clinics reported bomb threats, decreasing to 15% in 2000. One fifth of clinics in 2000 experienced some form of extreme activity.