At the above link there are definitions and statistics about aviation water landings since 1950. There are listings of three categories of water ditchings that give the specifics of the incident as well as the number and percentages of casualties. Below is my summary of it. Click the link for the specific details.
One lists survival rates of passenger plane water ditchings and says:
"In all cases where a passenger plane has undergone an intentional water landing or ditching
, some or all of the occupants have survived. Examples of water landings in which passengers survived after a planned and intentional water landing after an in-flight emergency are:"
There are 11 such successful ditchings listed dating as far back as 1952. Only 4 of them had a 100% survival rate and that includes flight 1549. Those ditches resulted in 237 deaths.
Another list has the number of planes landing on water for other reasons
"Aircraft also sometimes end up in water by running off the end of runways, landing in water short of the end of a runway, or even forcibly flown into the water during homicidal events
. While such incidents are just as rare as water ditching and are not quite water landings, the passengers do find themselves swimming. Twice at LaGuardia Airport, aircraft have rolled into the East River."
There are another 11 such incidents cited since 1968 and only 5 of those state there was a 100% survival rate. Lost lives in those 11 incidents total 205.
Then there is the list of flights that crashed into water
and explains the distinction this way:
"There is a distinction between a controlled ditching and simply crashing (not even crash-landing) into the water
; the latter is capable of killing everyone upon impact and disintegrating the plane."
There are 7 such events listed. One of them had a 6% survivial rate and another had an 11% survival rate. The others resulted in 100% fatalities or 985 deaths.
According to the data in the lists, in the last 60 years there have been a total of 29 water landings by commercial passenger planes. Nine of them had 100% survival rates and 5 of them had 100% casualties. The others range somewhere in between.
The data speaks for itself. Flight 1549 with 100% survial is indeed a rare event in commercial aviation and the crew and emergency responders earn our praise.