Hi Team
Here's a link to a presentation from 2013. Go to Slide 17 where there is a chart showing plantation survival rates over time...
http://www.asx.com.au/asxpdf/20130902/pdf/42j358fxj4zydl.pdf
Mortality is greatest during the 1st 2 years, then dramatically slows. Which I guess is to be expected as seedlings are vulnerable and that is when they need to latch onto host species