I recently stumbled on a plot provided by indeed.com:
I found it interesting that .NET even seems to be leading in the past and only recently Java had catched up with .NET. Somehow, I always thought it was the other way around. Also, Fortran does not seem to be visible at all. Most likely, because you wouldn’t enter any position because “you know Fortran”. Rather Fortran is somehow a requirement which you would need to learn in case your position requires it, I suppose.