Judicial Nomination Statistics and Analysis: U.S. District and Circuit Courts, 1977-2018 [March 21, 2019] [open pdf - 2MB]
From the Document: "In recent decades, the process for appointing judges to the U.S. circuit courts of appeals and the U.S. district courts has been of continuing Senate interest. The President and the Senate share responsibility for making these appointments. Pursuant to the Constitution's Appointments Clause, the President nominates persons to fill federal judgeships, with the appointment of each nominee also requiring Senate confirmation. Although not mentioned in the Constitution, an important role is also played midway in the appointment process by the Senate Judiciary Committee."
CRS Report for Congress, R45622
Congressional Research Service: https://crsreports.congress.gov/