How to dramatize the largely hidden loss of experience and expertise as federal workers call it quits? Here’s the National Active and Retired Federal Employees Association’s solution: On its web site, the group has built an online ticker that seeks to track the impact of that exodus down to the hour. Based on Office of Personnel Management data, NARFE calculates that the nation has lost an average of 10,000 years of federal worker experience every day since Jan. 1. It also suggests that the current political and fiscal climate is not inconsequential. “Sure, people retire,” the group says on the…