I need a list (or separate lists) with average prices of precious metals (gold, silver, platinum, palladium, etc.), by year. I prefer the annual average price or at least the price at the end/beginning of the year and I do not need graphs with prices fluctuations from one day/week/month to another.
Also price ratios (like gold/silver, gold/platinum - e.g. "in year 1900, with 33.33 ounces of silver you could buy one ounce of gold") are very useful for me.
International prices are desired of course, but the national prices are also very welcomed (like historical price of gold in the UK/US/France/Germany or any other country where someone actually bothered to record such facts).