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Output for 5.6.38, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5
array(1) { [2018]=> array(8) { ["JAN"]=> int(100) ["FEB"]=> int(400) ["MAR"]=> int(600) ["APR"]=> int(800) ["MAY"]=> int(400) ["JUN"]=> int(100) ["JUL"]=> int(300) ["AUG"]=> int(400) } }

preferences:
154.26 ms | 413 KiB | 5 Q