Perhaps we need some normalizing here. Divide the data into periods say
Old days 1800-1920s
Pre war 1920 - 1940
War 1940 - 1945
Post war 1945 -
Well you get the picture. Then we can look at relative run rates for those periods and then the record for highest run rate for that period.
This should show whether Bangladesh's record is particularly bad or just a case of being in the right place at the wrong time