Moving yearly Total Data / month

all values are listed as: M pkts

   time  |    total
---------+---------
2023-04  |  537.082
2023-05  |  545.151
2023-06  |  554.973
2023-07  |  551.540
2023-08  |  535.584
2023-09  |  516.930
2023-10  |  484.491
2023-11  |  470.526
2023-12  |  485.025
2024-01  |  502.440
2024-02  |  523.289
2024-03  |  541.286
2024-04  |  503.813