I do not work in the government, so I wouldn't want to prejudge as to why that decision was made. The act has a mandatory requirement for a state of the environment report, but one has not appeared since the act was passed. I'm assuming that it was because of a reallocation of resources. The act does not specify how frequently that state of the environment report is to be produced, but one would think that between one review and the next review there would have been one.
On May 17th, 2006. See this statement in context.