Also, saying your income is up 30% is a meaningless statistic... Is your traffic up... If your income with adsense is up 30% but your traffic is up 50%.. guess what, you are being paid less. Sharing one part of the equation does not help to answer any questions.
That made me think, it even made me look at my stats. For 2017, earnings up 32%, page views up 41%. So that's a 9% variance. But as ember writes:
So I moved my money to Pinterest. One less advertiser using Adwords. Multiply that by thousands of advertisers putting ad dollars elsewhere while publisher inventory keeps growing. The ad prices are going to drop, leading to lower epc prices for publishers.
I would think that that is a good enough explanation - as good as any other and a lot better than the one given below in my opinion.
They're changing the % that us publishers receive per click.
In reply to
What was before 2016?
The answer is we are now in 2018, who cares what happened in 2015? The whole market place has changed so much in three years that the comparison is meaningless.
"my main site" - are you traffic hunter, seeking for the Google algo vulnerabilities in hope to suck another couple of bucks from it?
I have a couple of legacy sites which I have not touched for a couple of years. I'm not searching for additional traffic from them, I let the traffic decrease. They are crap websites because they haven't been updated for so long. I only keep them for personal reasons. And as for trying to game the Google algo, that's absurd. The algo is so complicated and changing that I, for one, wouldn't spend any time trying to understand it.
small measurements can't be considered as statistically proven.
That depends on your definition of small. Consistency also must come into the equation as well as volume. When I see a % movement in earnings for February 2018 to date, and see roughly the same % movement over the entire year for 2017, I come to the conclusion that my February figures are statistically reliable. For my website at least.
I go back to my original point; for some, earnings and / or page views are going one way and for others they are going in a different direction. That's always been true. I just think the overall direction cannot be determined by reading the comments in this thread.