Our performance is influenced by movements in USD against JPY rather than EUR against JPY.
Our performance is more susceptible to movements in USD against JPY than EUR against JPY.
When USD appreciates against JPY, impact on our performance is larger than when EUR does against JPY.
"USD against JPY"で「ドル円」などを表せます。業績には、便利な単語"performance"を使いましょう。"[...] influenced by USD against JPY"としないことに注意してください。あくまで影響を及ぼすのは為替の変動"movements"だからです。
３つ目の文は少し趣向を変えて、「価値が上がる」という意の"appreciate"を使ってみました。
日本 
