mysql> SELECT
    ->     DATE_FORMAT(s.created, "%Y-%m-%d") as "Date",
    ->     count(s.id) AS "Accounts credited",
    ->     sum(s.withdrawal) "Total Credited"
    ->   --  100 * (sum(s.withdrawal) - sum(prev.withdrawal))
         --   / sum(prev.withdrawal) "Difference in %"
    ->     FROM statements s
    -> --    LEFT JOIN prev
    -> --        s.created - interval 7 DAY
    ->  --     ON prev.created = s.created - interval 7 DAY
        --     AND (prev.status_id = 'OPEN'
        --     OR prev.status_id = 'PENDING')
    ->     WHERE (s.status_id = 'OPEN' OR  s.status_id = 'PENDING')
    ->     GROUP BY YEAR(s.created), MONTH(s.created), DAY(s.created)
    ->       ORDER BY s.created DESC
    ->     LIMIT 8;

+------------+-------------------+----------------+
| Date       | Accounts credited | Total Credited |
+------------+-------------------+----------------+
| 2019-01-19 |             18175 |        3173.68 |
| 2019-01-12 |             18135 |        4768.43 |
| 2019-01-05 |             17588 |        6968.49 |
| 2018-12-29 |             17893 |        5404.18 |
| 2018-12-22 |             17353 |        7048.18 |
| 2018-12-15 |             16893 |        7181.34 |
| 2018-12-08 |             16220 |        9547.09 |
| 2018-12-01 |             15476 |        7699.59 |
+------------+-------------------+----------------+
8 rows in set (0.79 sec)