What is the exact meaning of the following passage? It is about the oil agreement between Iran and England in 1953. Of course, there were few passages before this one, which were related to one another as a, b, c, and so on. If more details or information were needed, I can add them. Its economic terms, due to their multiple meanings, make this sentence ambiguous for me."balance due the company" is problematic.
"If in any year the amounts deposited pursuant to (b) above less than one-twentieth of the balance due the company after the deduction of payments under (a) above, the company shall be entitled to receive and Iran shall deliver free crude oil equal to 25 percent of the amount, if any, by which Iran’s exports of oil and oil products in that year fall short of 20 million tons."