How much can we still earn from adsense at 2017 compare to 2012?

I have saw many post online saying that the adsense business for blogging at 2017 has became harder and harder. And those site traffic screenshots and adsense earning i saw online are few years back records… roughlt year 2012-2014… And many of the blogger realized their earning has been deducted in2017…

Some earning become less 20% and some even more 70%… so this a bit freak me out as i worry it is still consider a good path for me to continue my blogging path (as i just started…

How much can we still earn from adsense at 2017 compare to 2012?