Total employment rose by 496,000 in January after accounting for the adjustment to population controls. (See table A and the note on page 6.) The employment-population ratio--the proportion of the population age 16 and older with jobs--increased to 62.4 percent over the month. (See table A-1.)
That's half million in one month.
There's a natural attrition in the workforce. People die, retire, leave to have a baby or start a business, whatever. Most of them will be replaced with another employee.