As far as I know, we haven't done one. We could go back to the annual reports. Certainly more of this has been reported in the last year. It's gone up in the last few years. But I've heard, anecdotally, for example, from people who were involved in writing the act--senior civil servants who were young civil servants at the time--who said that it had always been the case that the incarcerated population made use of the Privacy Act from its very beginning.
On February 23rd, 2009. See this statement in context.