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Could say something about the market, something about boinc projects added or removed, GDPR, or whatnot, though I personally think swings are expected in short time frames (3-12 months). In larger practical scales we're going up in most metrics.

Most of the stats are covering up to 1 year back, which is a good % of all this project's "Age".
And almost all trends are going down, some since 1 year ago, some other as of November aprox (somehting happened?) Just see Acitve members and % Of Active members (gridcoind Boinc team).

Jringo is right about the effect on the chart trends regarding boinc projects being added or especially removed from the whitelist. For example, the Gridcoin team on PrimeGrid is still ranked as the 4th top team with active members crunching away even though the project dropped off the whitelist in October 2018. Similarly, the Gridcoin team on Einstein is still ranked 2nd, but the project has been off the whitelist since June 2018. If earning GRC research rewards was the sole incentive for crunchers, they would move their computing power to the projects that maximize their earnings. However, we see that some crunchers stay with a project and team Gridcoin even if it is no longer whitelisted.