1991!

from wiki:

One factor that helped making KADs visible in the South Korean discourse, was a 1991 film called Susanne Brink's Arirang, based upon the life and experiences of Susanne Brink, an adult KAD from Sweden who stated to have suffered abuse and racism in her adoptive home and country. After the movie she became a celebrity in South Korea, and many South Koreans started to feel shame and guilt for the children their country had sent out (Hübinette, 1999). Since then, South Korean media rather frequently reports on the issues regarding international adoption. Most KADs have taken on the citizenship of their adoptive country and no longer have Korean passports. Earlier they had to get a visa like any other foreigner if they wanted to visit or live in South Korea. This only added to the feeling that they were 'not really South Korean'. In May 1999, a group of KADs living in Korea started a signature-collection in order to achieve legal recognition and acceptance (Schuhmacher, 1999). At present (2009) the number of KADs long term residents in South Korea (mainly Seoul) is estimated at approximately 500. It is not unlikely that this number will increase in the following decade (International adoption from South Korea peaked in the mid 1980s). A report from Global Overseas Adoptees' Link (G.O.A.'L) indicates that the long term returnees (more than one year) are predominantly in their early twenties or early thirties.

This is the perils of looking at the issue through an American lens. Hmm.