Administrative Regulation Governing Tariffs of Type I Telecommunications Enterprises Article 3

Primary tariffs of dominant Type I Telecommunications Enterprises shall be regulated by price cap and shall be subject to the following formula:[(Pt - Pt-1) ÷Pt-1] x100% (ΔCPI - X)
中文原文 第一類電信事業資費管理辦法第3條
第一類電信事業市場主導者主要資費之管制採價格調整上限制,其公式如下:[(Pt–Pt-1)÷Pt-1]×100%≦(△CPI–X)

English translation for reference only; the Chinese text prevails. Not legal advice.