To add context: The British period for Malta is 1814 - 1964. Most sources agree these things were made about 100 - 150 years ago, but the exact date is unsure.
This is a graph of the sea rise in the past 140 years: https://en.wikipedia.org/wiki/Sea_level_rise#/media/File:1880-_Global_average_sea_level_rise_(SLR)_-_annually.svg
Local sea rise due to global warming is around 30cm, local tides are also around 30cm.