The following is the Sept. 24, 2020 Congressional Research Service report, Navy Virginia (SSN-774) Class Attack Submarine Procurement: Background and Issues for Congress.
From the report
The Navy has been procuring Virginia (SSN-774) class nuclear-powered attack submarines (SSNs) since FY1998. The one Virginia-class boat that the Navy is requesting for procurement in FY2021 would be the 33rd boat in the class. The Navy’s FY2020 budget submission had projected that the Navy would request two...
https://news.usni.org/2020/09/25/report-on-virginia-class-attack-submarine-program