The economic authority of Taiwan has approved investment totaling 77.13 million U.S. dollars from the Chinese mainland, according to a statistics report released Monday.

From the end of June last year when Taiwan opened to mainland investment, the authority had approved 52 investment projects on the island by the end of May, said the report from the authority.

The top three industries for mainland investment -- accounting for 44.84 percent of the total mainland investment -- were computers, electronics and optical products manufacturing.

At the same time, the mainland saw a sharp increase in investment from Taiwan. In the first five months of this year, the Taiwan authority approved investments in 187 projects on the mainland.

New investment from Taiwan on the mainland from January to May totalled 4.59 billion U.S. dollars, a year-on-year increase of 239.9 percent.

About 75 percent of the Taiwan investment in the first five months went to Jiangsu, Guangdong, Fujian and Shandong provinces, said the report.