Must-read from @JostonJustice:

In fact, it was a bad term overall for Scalia: apparently his worst ever. He dissented in 23 cases, the highest number at least since the 1992-93 term when I began counting dissenting votes for my annual series Supreme Court Yearbook.
Scalia was not alone. The court’s three other reliable conservatives also had personal-worst years. Justice Clarence Thomas dissented in 29 cases: not only his highest number, but also the highest figure for any justice since OT 1992. Justice John Paul Stevens held the previous record: 28 dissents in two separate terms, 1999-2000 and 2008-09.
The Supreme Court Yearbook compilation does not reach back to Scalia’s first six terms or Thomas’s first. But the court’s conservatives generally held sway during those years, so their dissenting numbers were unlikely to have been on the high side.