PC(USA) -- losses in membership

I have made a few blog posts in the past on the PC(USA). My intention has not been to be mean-spirited, but to honestly probe what happens when the simple yet counter-cultural teaching of Scripture is circumvented in the name of relevance. That having been said, I am in no way denying that there are some God-honoring, Christ-exalting, Bible-affirming PC(USA) pastors out there. For example, I've been blessed by much of what Mark D. Roberts has been sharing.

Here are some of the sad statistics on the massive decline in membership within the PC(USA). In short, a loss of 65,000 in 2005 and an estimated loss of 85,000 in 2006. Does anyone have access to an explanation from PC(USA) leadership regarding these numbers?

(HT: Mark Driscoll)