Take it for what it’s worth, but here’s a data point to start the week: Since fiscal 2011, about 1,268 IRS employees have taken advantage of early retirement and buyout offers. That number amounts to a bit more than 1 percent of the agency’s workforce, which totaled almost 91,000 as of December, according to official figures posted online. Federal Times received the information under a Freedom of Information Act request filed earlier this year after attempts to obtain the data from the IRS’ public affairs office in Washington were unsuccessful. The mini-exodus is part of a looming human capital challenge…