1977.
ش 츮 ش. 100 ̱ ̴. , ƽþƿ ֺ ߴ ѹα 100 1977̶ ̴.
å ġ, ȸ Ȳ ϸ Ϸ ߴ. ٸ, (1977) ̳ 츮 Ǵ ǵ Ѵ. 츮 100 ϸ ϴ ̵ ƾ Ѵٴ ̴.
̿ £ ѹα ѳ 츮 ƹ, Ҿƹ ְ, ̸ ˰ ִ ̶ , ȣ ȭ̸ 츮 Ӵ ƹ, ҸӴ Ҿƹ 밡 ִ. ġ ڽ ν , ȴٴ Ǹ ϴ (Ʈ)̶ 忡 پ ̵ ־.
̵ Ѱ. ֱ. Ѹ ̵ 뺯ϰ ʹ. 1977 츮 100 ϰ ĸ ־ ع ̺е ־ 츮 , ѹα̶ ȿ ȴ.
츮 ִ. ƴ ־. ֱڵ ƴϰ ι鵵 ƴϴ.
ȭ̴. ڽ ȭ ϱ Ȱ, ¼ ڿıڵ̴. 1960, 70 , 츮 10~20% ϴ ٷ ȭ̴. α. ڿ ӿ . ڿȣ, 긲ȭ 켱 å ̻ ȭ Ǿ. 翬 ȭε ȭ ؾ ߴ.ڽŵ Ǿ ڴ ƴϴ. . ٸ, 鵵 ־ٴ ϰ ʹ. 츮 ϰ ʹ.
ȸ ְ ִ. ü ˰ ִ. ȭε ˷ ʾҴ. Ҽ̰, ڰ, , ¼ ֱ ̴. ȭ ־ ̴. ʴٸ ȭ ϱ ״ ̴. ϰ ;.
å ΰ б( ʵб) г ҳ, û ̴. ҳ ƹ ̿ ̱̰, 翡 ο ϴٰ ȭ̿ Ϸ ߴ. ߰, ҳ ƹ ȭ ϱ. ֱڰ ڰ ϱ ϴ ̴. ϴ ̴.
ڽ ϴ. 1976 ( ɷ) ȭ 긲ȭ ȹ ȮϷ ȭ 湮Ѵ. ǿ ġ ڽ ӹ ȸdz, ȸ . ҳ . ŭ ڿȣ 긲ȭ ʹ ߿ å̰, Ĵ븦 ؼ ʿ ̴.
. ȭ ϴ ҳ, ϴ . ̻ϰ ۵ȴ. ̽ ϴ , ϰ ȴ. Բ ɾ ̽ . ȥ ư ̽ . ϱ.