"The new year has begun. Congratulations."
(明けましておめでとうございます。)
解説
「新春のお慶びを申し上げます。本年もよろしくお願いし上げます」"Best wishes for the new year. Please give me your favorable consideration this year, too."、「昨年中はいろいろとお世話になりました」"Last year you were very helpful to me." "Thank you very much for everything you did for me last year."(参考:『日本の挨拶ことばを英語でどう言うか』(日本実用英語サービス))