We changed our style several years ago on plurals like this. Here’s what the current “plurals” entry in The Times’s stylebook says:
But do not use apostrophes for plurals of abbreviations without periods, or for plurals formed from figures: TVs, PCs, DVDs; 1990s, 747s, size 7s.
“Words We Love Too Much”, Philip B. Corbett, NYT
To which I say: it’s about damn time.
