The diagram presents the distributions of processing petroleum by OPEC countries and non-OPEC ones, with a 40-year period starting from 1980 to 2020.
Overall, a holistic upward trend could be observed by 2010, after which a moderate decline in world oil production would be expected. While a significant climb in oil production in non-OPEC countries had taken place over the period, an opposite trend could be seen in other OPEC countries, with the remaining Middle East ones contributing substantial oil before shrinking again in the following years.
At the beginning of the period, the other OPEC members attributed the largest amount of the production of the world’s oil at 10, surpassing much more than that in the non-OPEC countries (2). After two decades, the three categories turned out to contribute similar patterns at around 7. Notably, the other OPEC countries’ production of oil dropped in half compared to the previous years, while the non-OPEC countries tripled and the remaining OPEC Middle East sparked suddenly at 6.
In the following twenty years, the output of oil production in non-OPEC countries experienced a maintaining increase trajectory primarily and attained the summit of 16, doubling that in 2010. However, the remaining two categories were comparatively negligible, which took up marginal proportions (1 each).