Erard serial numbers

When I bought my Erard piano (nr 38180), I tried to find its age. Internet is full of quasi-exact dating of Erard pianos, but in fact the doubts are huge. So, I decide to make my own research and put together all documented facts about relations of Erard serial numbers to years of production. I have used different sources, so I am only a compiler, but not the author of information. So, if you need to date your own Erard piano, you can use this table.