The answer is shockingly simple: By holding interest rates at or near zero for so long, the Fed has been forcing seniors to switch to riskier investments like stocks and mutual funds just to maintain their standards of living.

FORBES: Ben Bernanke's War On Senior Citizens

Toyota has always believed that fuel cell technology is the long-term answer for zero emissions driving, so the company pulling back from a tepid market should not be viewed as a surprise.

FORBES: Retreat on EVs Not a Rout

While no definitive answer is possible, of course, an exhaustive study of the available data suggests that the number is zero.

CNN: ASIANOW - TIME Asia