There's no easy way to measure this because there is data that can support any argument.

What index do you use to chart the price of stocks over a given time? What time frame do you use?

Personally, I just use the TSV to track junior resource stocks. There are many efforts to make up propriatory indexes but the TSV serves my purposes quite well. If the TSV is doing well junior resources are. If it's doing poorly so are the juniors. Technicals hold up and break down on the TSV more accurately than they do on other indexes which are based on a smaller sample or smaller volume. It's true that the TSV is not 100% resource but it's very high. I tried finding out the number but couldn't. Anyways, just my experience is that this is the best index to use for most purposes.

So if you look at how the TSV has faired over the past 7 or 8 years compared to all other commodities, the commodities win slightly but if you look just at gold and silver it's pretty close. GOLD and Silver have quadrupled from their low to their high and so has the TSV.