Previous years have been quite sad. The Mother duck starts out with about 12 ducklings and usually ends up with 2 or 3. We're not sure what happens to them but there is the road, foxes, drains (we once saw half a dozen ducklings fall down a drain, but luckily were rescued).
This year the Mother has ten ducklings who have all reached a very good size so that's a big improvement on the last six or seven years. She certainly knows where to get a few slices of bread!