A just published article on women and work in the Japan Times contains the following paragraph.

Japan's female labor participation rate is 73 percent, according to a report last year by Kathy Matsui, Goldman Sachs Group Inc.'s chief Japan strategist and the author of reports on "Womenomics" that have been cited by Abe. That compares with a high of 96 percent in Finland, and 85 percent in the United States, according to Matsui.

http://www.japantimes.co.jp/news/2014/04/04/business/ab
e-may-reduce-tax-benefits-for-women/

I can find nothing that appears to be a report "last year" (2013) and I cannot find female labor force participation data to match what it is asserted in the paragraph. I've looked at US Bureau of Labor Statistics, World Bank, and OECD data. All give much lower numbers for the countries cited. OECD data shows only a small difference between Japan and the US.
Numerous news reports say the US rate is going down, the Japanese rate is going up. Government sources put the employment rate for women in Finland at 65% with the long run secular trend as one of decline.

Does anyone have any idea where these numbers come from?

Given that labor force participation rate is usually defined as the ratio of those in employment or seeking employment to the total population in the 16-64 age cohort, a rate of 96% seems improbably high for any country where a large fraction of secondary education graduates go on to higher education.

Indeed, one would expect female participation rates to drop as a larger fraction of women go on to higher education because that would mean that an increasing fraction of the 16 through early 20s cohort would not be seeking work or in employment.

EHK