The CIO of a global macro fund is assessing the performance of the international portfolio managers of the fund. The CIO gathers the annualized total returns of a sample of the managers as presented in the following table:

| Portfolio manager | Annualized total return |

|-------------------|--------------------------|

| 1 | 21% |

| 2 | 17% |

| 3 | 11% |

| 4 | 18% |

| 5 | 13% |

What is the correct unbiased sample variance of the returns data?