"IT has really been one area of targeting for cost reduction and bringing teams together across different departments," says New Zealand Computer Society CEO Paul Matthews.
"I think there's been quite a focus of reducing the internal teams and contracting out more, where possible."
The numbers are not a major cause for concern, he said - though he would be concerned if they continue to drop at this rate.
"You do have to be a wee bit careful when you consolidate and save costs, that you're not losing the people that have the institutional knowledge."
The survey also shows that unplanned turnover of ICT staff jumped from 8 per cent to 16 per cent in 2011.
"Sometimes in any role people start to see the writing on the wall.
"If a department is downsizing or has indicated that they are looking to outsource more work, then you find that people may look to move to the contracting party or elsewhere."
Some of the unplanned turnover could be explained by employees changing roles across the board, "following people staying where they were through the worst of the economic downturn".
A shift to cloud computing was unlikely to be a major factor, as the government has been slow to adopt the new technology.
Mr Matthews said he hasn't noticed a great amount of discontent among government ICT employees.
"It's probably a case of just keeping an eye on it an seeing if it's a bit of a blip... or if it's more of a trend over time.
"We're not raising major alarm bells at this stage, but it's certainly one that we're watching."