DUBAI (Reuters) - Saudi Aramco shares were up 1% at 37.2 riyals (7.71 pounds) in early trade on Sunday.The state-owned oil company listed 1.5% of its shares at 32 riyals on Riyadh's Tadawul exchange on Dec 11 in the world's largest initial public offering (IPO).Initially valued at $1.7 trillion, the shares have since hit $2 trillion, a value long sought by Saudi Crown Prince Mohammed bin Salman.The IPO is the centrepiece of the Saudi leader's plans for diversifying the economy away from its..