You can label the ticks however you wish --
However, that doesn't change the data of course so the datatip cursor will still show the actual data values.
You would have to plot(x,y-200) to do that easily; otherwise I presume there's a way one could manage to write a callback function but I've not explored that aspect.
Above changes them all, overlooked the details of the plot, sorry.
I think stackedplot is probably the built in solution that comes closest to wished-for look.