Has ad earnings really dropped by ~90% since a few months ago?

I used to earn about 20-22 BAT (~$10-12). Now I earn about a 10th of what I used to earn - not even a single dollars worth of BAT, in a whole month.

Is this really the new level of ad earnings?
~3 BAT a month (less than $1 per month) for 5 ads/h setting and using the browser ~6+ hours a day? This is ~10% of what it was just 2-3 months ago. Is this really what I should consider “normal” now?

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