From Morningstar, here's  the revenue stream for Exxon since 1994:

The year 2005 (not shown) saw revenue of $340,000,000,000, a significant jump over 2005.

Exxon doesn't need to increase production to grow it's revenues.  I would think the company is simply managing it's reserves, much like an insurance company, in order to smooth the growth path.

Correction:

"The year 2005 (not shown) saw revenue of $340,000,000,000, a significant jump over 2004".

That's a damn lotta zeros.