The Bank of Japan has made no progress in increasing the proportion of women in management positions in the past two years.

Women held 4 percent of management posts in 2015, which was unchanged from 2013, according to a comparison of a statement released Tuesday and one from 2014. The central bank, in the statements, said it aims to boost the ratio of women managers to 5 percent in 2018 and 10 percent in 2023.

Last week Prime Minister Shinzo Abe opted against giving another term to the BOJ board's only woman, Sayuri Shirai, when her term expires March 31 and nominated a man to take the post on the nine-member board.

The government is aiming to have women as 7 percent of managers in the national bureaucracy by 2020, well short of Abe's target that had been announced previously of 30 percent across all fields.

"We are increasing female workers but it takes some time to have more women at senior levels," Marie Ogawa, a director of the diversity and inclusion group at the BOJ, said by phone Tuesday. "We will keep making efforts to achieve the targets."

Under a law passed by the Abe government, companies with 300 or more employees will be required from next month to publish data on the number and roles of female employees, as well as action plans for promoting women.