Assuming that most of the workforce is between the ages of 20 and 64, approximately how many people were in the workforce in Kenya in 2010?

I believe the answer is around 15,473,810

For comparison, Kenya's population for the year of 2010 is around 40 million.

This number is pretty problematic because it indicates that less than a half of Kenyan's population is contributing to the economy. Due to this number, the Governmet of Kenya keep promoting several programs that would give incentives for family with large amount of members.