The EIA has released the annual price data for 2008, and as expected, the average 2008 spot price is slightly (35¢) below $100:

Here are the year over year exponential changes in US spot oil prices since 1998 (the one annual decline is highlighted):

1999: +30%/year
2000: +45%/year
2001: -16%/year
2002: +1%/year
2003: +17%/year
2004: +29%/year
2005: +31%/year
2006: +15%/year
2007: +9%/year
2008: +32%/year

The 10 year (1998-2008) rate of increase was +19%/year (doubling about every 3.8 years).

If oil prices average $50 in 2009, the 11 year rate of increase will be +11%/year (doubling about every 6.5 years), and the year over year decline rate would be -69%/year (a 50% reduction in price in one year).

westexes,

Since I have learned so much from you here on TOD, I owe ya' a favor...so take it for what it's worth, just don't bet every cent you got on that curve, o.k.?

:-)
RC

Nothing to bet on, the curve, through 2008, is historical. Nothing is going to change it.

But it will be interesting to see what the next 10 years looks like--out to 2018.

Using the three exponential rate of change numbers referenced above:

At +19%/year (1998 to 2008 rate of increase), nominal oil prices in 2018 would be $668.

At +11%/year, nominal oil prices in 2018 would be $300.

At -69%/year, nominal oil prices in 2018 would be 10¢ per barrel.

(There is actually a certain symmetry to 2018, versus 2008. Our middle case is that the top five have, through 2008, shipped about 20% of their post-2005 cumulative net oil exports, and our middle case is that by 2018, halfway to projected near zero net exports, they will have shipped about 80% of their post-2005 cumulative net oil exports.)

so WT,
if we assume that gold is an inflation hedge, and gold has increased at a rate of 11% / year on average over the past 10 years ($290 - $850)
then 11% is the real rate of inflation

if you deflate oil by the rate of growth of gold over that last 10 years

19% - 11% = 8% real growth in oil prices over and above inflation

or of course you could say that becuase golds rate of increase over the past 40 years has been about 8.9% per year (better than the S&P!) so perhaps oil, once it got out of an over supply situation, was mostly driven by inflation for most of the past 10 years,

and it is now driven by a declining supply to go beyond the "gold inflation rate" if the nominal rate of 10-20% keeps up