Interpret a turnover rate of 200 percent. What does it mean?

Isabelle Anderson is the North Carolina plant manager for Hall Manufacturing Company, a company that produces a line of relatively inexpensive painted wood furniture. Six months ago, Isabelle became concerned about the turnover rate among workers in the painting department. Manufacturing plant turnover rates in that part of the South generally averaged about 30 percent, which was the case at Hall. The painting department, however, had experienced a turnover of nearly 200 percent in each of the last two years. Because of the limited number of skilled workers in the area, Hall had introduced an extensive training program for new painters, and Isabelle knew that the high turnover rate was costly.