Overall, an estimated 3.4 million people identified themselves as victims of stalking during a 12-month period in 2005 and 2006. About half of them experienced at least one unwanted contact per week from the offender and 11 percent had been stalked for five or more years. The most common types of stalking behaviors were receiving unwanted phone calls from the offender (66 percent), receiving unsolicited letters or e-mail (31 percent), or having rumors spread about them (36 percent). Nearly 75 percent of victims knew their offender in some capacity, and about one-tenth were stalked by a stranger. Read the DOJ report here.