Japan is becoming progressively poorer and poorer. For example, the average salary for a Japanese is comparatively lower than that of other people's.
In addition, the living cost is high, the Japanese yen is becoming weaker, and Japan is no longer one of the top players of the world.
ご質問ありがとうございます。
"Japan is becoming progressively poorer and poorer."＝「日本は徐々に貧しくなってきています。」
"For example, the average salary for a Japanese is comparatively lower than that of other people's."＝「例えば、日本人の平均賃金は他の人々のよりも低くなっています。」
"In addition, the living cost is high, "＝「その上、物価は高く」
"the Japanese yen is becoming weaker,"＝「円安は進んでおり」
"and Japan is no longer one of the top players of the world."＝「日本はもう世界のトッププレイヤーには入っていません。」
ご参考までに。
アメリカ合衆国 
