* Loadings for China hit highest since Sept. 2014 * WAF-Asia April loadings at eight-month high * Korea, Australia book Nigerian oil * Graphic: http://link.reuters.com/sav75v By Libby George LONDON, March 31 (Reuters) – China’s loadings of West African crude oil were on track to hit their highest barrel-per-day level in 19 months in April, according to a Reuters survey of shipping fixtures and traders on Thursday. The boost is due to strong demand from the country’s ind

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