这个that 是什么词性?为什么这么用?

这个that 是什么词性?为什么这么用?We may well predict that,in the 21st century,the overall shift in Internet use will be similar to that outlined for the economy and the number of computer hosts in Asia will eventually outstrip those in English-speaking countries.我认为,可分为两句,第二句从 and the number...countries.第一距离就那个that不理解!翻译起来就比较通,outlined也顺理成章成 Past participle.但我从来没见过that可以被分词修饰,我指的“第一句”里的“that”是指“to that outlined for the economy”的"that"。请不要误解~