BOSTON (AP) — Most Massachusetts teachers earned good grades under the state’s evaluation system last school year.

Data released by state education officials on Tuesday showed that about 86 percent of teachers earned a proficient rating in their performance reviews for the 2014-15 year, roughly the same as the previous year.

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About 10 percent were deemed exemplary, the highest rating, up from 8 percent a year before.

Meanwhile, 4.5 percent of teachers were found to be in need of improvement or unsatisfactory, a slight decrease.

This is the third year of the state’s teacher evaluation system, but the first year that all school districts were expected to participate.

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Education officials said the data confirm that most teachers in Massachusetts are doing a good job, and that those who aren’t either improve or leave.

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Online: School- and district-level evaluation data can be found at http://profiles.doe.mass.edu/state_report/educatorevaluationperformance.aspx

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