Driven mainly by an extraordinary influx of Hispanics, the nation’s population of minority students has surged to 42 percent of public school enrollment, up from 22 percent three decades ago, according to an annual report issued yesterday by the government.

The report, a statistical survey of the nation’s educational system, portrays sweeping ethnic shifts that have transformed the schools. The changes, with important implications for educators and policy makers, have been most striking in the West, where, the survey says, Hispanic, black and Asian students together have outnumbered whites since 2003. But all regions have seen growth in minority student enrollment, particularly by Hispanics, who accounted for one of five public school students in 2005, the last year for which data were available.