It's up 74% since 1999. Reasons given (from a 2007 survey):
- Concern about the school environment, including reasons such as safety,drugs or negative peer pressure – 88 percent
- A desire to provide religious or moral instruction – 83 percent
- A dissatisfaction with academic instruction at other schools – 73 percent
- Nontraditional approach to children's education – or "unschoolers" who consider typical curriculums and standardized testing as counterproductive to quality education – 65 percent
- Child has special needs (other than physical or mental health problems) that schools cannot or will not meet – 21 percent
- Child has a physical or mental health problem – 11 percent