The expectations are in percentage terms in order to compare the commodities. The number next to each commodity is the percentage difference between the expected price in the last quarter of 2007 and the current price.
Interestingly, oil is expected to decline steadily by -17.66% by the end of 2007 while natural gas is expected to climb 21.35%. Gold is also expected to rise 8.44% while silver and platinum are expected to decline over 15%. Something just doesn't seem to add up there. Expectations for copper are the grimmest at -34.17%.