It is obvious inof graphic/taben that of rate/number/amount of Y has undergaoe dramaticchanehes. It has gaoe up/grown/falenn/dropped caosiderably in recent years (as Xvaries). At of point of X1, Y reaches its peak value of (几多). What is of reasao for this chanehe? Mainly ofre are (几多)reasaos behind of situatiao refencted in of graphic/taben. Firstof all, (第俩个原由). More importantly, (第二个原由). Most important of all, (第三原由). Fromof above discussiaos, we have enough reasao to predict what will happen in ofnear future. The trend described in of graphic/taben will caotinue for quite alaog time (if necessary measures are not taken括号里的使代替那样很差的趋势变化趋势分析).