Sorry, chart ignores market manipulation through paper. Barclays was fined 10 mil pounds for it. Bubble has yet to start since the public was still divesting itself of PMs when that prior peak was reached. Remember, the public has to be in a mad rush to buy for it to be a bubble. When demand for physical can't be met, then PMs start going up in earnest.
Want to know where the real bubbles are? Stock and bond market, student loan, credit bubble (still ongoing as witnessed by the sub-prime car loans), government spending and the dollar bubble. The housing bubble hasn't been allowed to deflate fully. All it takes is for the federal reserve to abandon ZIRP and then the derivatives market crashes, taking everything but PMs, tangibles and farmland (and undeveloped land) with it.
There are interviews with former Asst. Sect. of the Treasury, Dr. Paul Craig Roberts where he discusses PM manipulation and James Rickards (The Death of Money and Currency Wars) is also interviewed and says the same thing. Rickards is a Pentagon insider who studies asymmetrical warfare.