The following is the Nov. 17, 2021 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, and a total of 34 have been procured through FY2021. Since FY2011, Virginia-class boats have been procured at a rate of two per year.
