(Inver Grove Heights, MN)  —  The country’s top-grossing cooperative is returning a massive amount to its members.  Inver Grove Heights-based CHS is giving out one-billion dollars in patronage pay and equity redemption to its members.  The payout was announced yesterday morning, and reflects soaring oil and ag commodity prices.  It is the largest amount in company history, and four times the amount CHS paid out to owners last year.