Dear Earl Kinmoth,

there is an opinion article written by Abe Shinzo published in the Wall Street Journal last year, in which he refers to Matsui's Goldman Sachs Report from 2010.
The number 73 percent is there given as an estimation for the year 2020 that Abe's government has set as a target yet to be achieved.

Another possibility is that the numbers refer to the labor force participation of university-educated women only.

With best regards,
Annette Schad-Seifert