Moving backwards, from the 4th quarter to the first:
1) For the 4th quarter, there are so many separate-but-interrelated issues involved, that the number could go anywhere. There could well be further social explosions, for example, keeping in mind that the elections are in November. What if the losing side refuses to accept? What if Homeland Security, battling against BLM, clashes with whoever is sent to put down the trumpeters? Meanwhile, the course of the epidemic in the US is totally unpredictable right now as well. And what about the long term consequences of the steep and
prolonged economic downturn the US is in? The only thing that is certain, in my view, is that if the economy goes up at all during the fourth quarter, it will be by a tiny amount. It could also be zero, or could go down by a small amount, or by a large amount. Best to wait for real numbers, if we're lucky enough to get them.
2) I don't know where you get 101% for the third quarter (I didn't see it in
@localizer 's figures). I expect the number to be below 100% frankly, though it's too soon to tell.
3) For the second quarter, keep in mind that it's still an only "estimate". There are others that are a bit kinder, but we'll have the official figure in about a week.
4) For the first quarter, the 95% figure given before was also "annualized" so that, using the same procedure (fourth root), you get about 98.73%
For the first two quarters, this gives you 87.96%, as compared with the 4th quarter of 2019 "seasonally adjusted". You are right that it could go deeper, but since it's impossible to quantify, I would just stick to saying it's deep as hell.
In my view, the actual number doesn't really matter so much; the length of this deep downturn matters more, because this will affect trade flows, relative standing, and ultimately the value and role of the dollar.
Already ASEAN has become China's top trade partner, passing both the EU and the US. Meanwhile, China is also becoming more important for the Europeans. Check this
out: