At the beginning of the 21st century, approximately what percentage of U.S. classrooms had at least 1 ELL student?

Question

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According to data from the National Center for Education Statistics, in the year 2000, approximately 9% of students in U.S. classrooms were identified as English language learners. This number increased to 10% by 2005 and has remained relatively steady since then. Therefore, it can be estimated that at the beginning of the 21st century, around 50% of U.S. classrooms had at least one ELL student.

At the Beginning of the 21st Century, Approximately What Percentage