USCIS has updated the Immigration & Citizenship Data page with data for petitions processed in FY2019 Q2 (January to March 2019).
The results are shocking. Instead of recovering from the already-dramatic 37% decrease in processing volume last quarter, IPO processing volume fell another 60% in Q2. To look at raw numbers, IPO was processing over 4,000 I-526 per quarter this time last year, but processed less than a 1,000 I-526 in FY2019 Q2.