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The number of samples collected each month of four periods.
| Period | Month | Number of Samples | Number of Samples/Period |
|---|---|---|---|
| March | 41 | ||
| Spring 2020 | April | 15 | 59 |
| June | 3 | ||
| July | 13 | ||
| Summer 2020 | August | 24 | 38 |
| September | 1 | ||
| Autumn 2020 | October | 39 | 39 |
| Winter 2021 | January | 6 | 93 |
| February | 87 | ||
| Total | 229 |
