51．A increased by．．．％．
    A增长了……百分点。
52．A increased to．．．％．
    A增长至……百分点。
53．high／low／great／small percentage
    比例高(低)
54．whereas／while．．．
    而……
55．The number,soared／rocked to a record high of．．．
    数字剧增至历史新高……
56．There is an upward trend in the number of．．．
    ……数字呈上升趋势。
57.A considerable increase／decrease occurred from…to…
    ……到……发生急剧上升(下降)。
58．From．．．to．．．，the rate of decrease siowed down．
    从……到……，下降速率减慢。
59.From this year on，there was a gradtlal decline／reduction in the．．．，reaching a figure of．．．
   从这年起，……逐渐下降至……
60．after that／afterwads
    之后