Try these 2 url’s for dropout rates of students in America.

“The status dropout rate is the percentage of 16- through 24-year-olds who are not enrolled in high school and who lack a high school credential. A high school credential includes a high school diploma or equivalent credential such as a General Educational Development (GED) certificate.”

Public high school graduates and dropouts, by race/ethnicity and state or jurisdiction: 2001–02 and 2003–04

http://nces.ed.gov/programs/digest/d06/tables/dt06_102.asp?referrer=list

Percentage of high school dropouts (status dropouts) among persons 16 to 24 years old, by race/ethnicity: Selected years, 1972-2005

http://nces.ed.gov/fastfacts/display.asp?id=16