the long memory:
www.zmag.org/znet/viewArticle/17778

u.s. oil imports down in 2007:
www.seacoastnrg.org/2008/03/31/us-oil-production-increases-barely-imports-down/

china oil imports down in April y-o-y:
www.forbes.com/markets/feeds/afx/2008/05/12/afx4995121.html