Both economies have shown a considerable increase of the SSDI followed by a sharp decrease of it. This explains an important increase of the SSDI during the 1990s. In the second part of the 1990s, Russia (a non-OECD country) became the primary oil supplier to Finland. Because of this, the SSDI values decreased during the last 15 years. After 1987, the SSDI values for Korea started to fall, and only since 1996-97 has the country’s score begun to rise. One may note that total energy demand in Korea was growing very fast since the mid-1970s, in line with economic development.