It is reported that employees in Central PSUs have been reduced from 29 lakhs to allmost half during the last decade.
This is mainly due to nonrecruitment  or scant rectuitment while tens of thousands are retiring every month.
It is the same with BSNL also. When BSNL was formed in 2000  there were 3.5 lakh employees, who have been reduced to 2.5 lakhs now.