Moving yearly Total Data / month

all values are listed as: k pkts

   time  |    bcast    bogey
---------+------------------
2024-09  |  103.013    0.002
2024-10  |  103.017    0.002
2024-11  |  103.012    0.002
2024-12  |  103.010    0.002
2025-01  |  102.991    0.002
2025-02  |  102.709    0.002
2025-03  |  102.701    0.002
2025-04  |  102.686    0.002
2025-05  |  102.702    0.011
2025-06  |  102.702    0.011
2025-07  |  102.681    0.011
2025-08  |  102.672    0.011
2025-09  |   98.798    0.009