Crude and natural gas prices.
http://www.bloomberg.com/energy/
Silver and gold prices (continue to drop, too).
http://silverprice.org/
What about the value of the dollar in relation to the price of oil dropping and commodity prices ?
You have to look at the purchasing power of gold and silver not the amount they are valued in fiat dollars. For instance, in 1960 you could buy a gallon of gas for 25 cents. Today that 90% silver quarter is worth $3.00.