What a thought-provoking and illuminating chart it is! As is apparently depicted in the chart, it is obvious that（内容）soared from（数据）in（年份） to（数据） in（年份）, While, as a sharp contrast, （内容）decreased from（数据）in（年份） to（数据） in（年份）.In addition ,（内容）was almost the same in（年份）and（年份）./（there was only a slow increase from（数据）in（年份） to（数据） in（年份））（有就写，没有不写）
Why does this phenomenon revealed in the chart above appear? Several reasons accounting for the situation can be as follows. To begin with ,I am strongly convinced that this is partly due to the fact that（原因一）, In addition, this is partly because ，（原因二）, Last but not least,（原因三）cannot be ignored. (Maybe there are some other reasons bring about this phenomenon. But it is generally believed that the above mentioned reasons are commonly acceptable.)根据情况，最好不加，实在字数不够再加
From the analyses made above , we may come to the conclusion that（结论）. I am sure my opinion is both sound and well-grounded.(和后面的二选一使用) And I can give the judgment that this trend of the chart may still go up (decrease/ keep the same) in the years ahead.
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