1960s - DDG ‐ a ratio of 1 officer to 15.65 crew
1980s - FFG ‐ a ratio of 1 officer to 7.5 crew
modern - Armidale - a ratio of 1 officer to 2.5 crew
I've heard that other nation's services are seeing commensurate changes.
[0]: http://www.defence.gov.au/Whitepaper/docs/036-O'Keefe.pdf