19 the number sharply went up to ...
20 the percentage of ... stayed the same between ... and ...
21 the percentage remainede steady at...
22 the percentage of ...is sightly large than that of.
23 there is not a great deal of differece between ...and ...
24 the graphs show a three fold increase in the number of ...
25 ...decreased year by year while ...increased steadily.
26 there is an upward trend in the number of ...
27 a considerable increase occurred from ...to ...
28 from ...to ...the rate of decrease slow down.
29 from this year on,there was a gradual declinel reduction in the ...reaching a figure of.
30 be similar to ...be the same as
31 there are a lot similarities between ...and ...
32 the difference between X and Y lies in ...
雅思写作考试的备考不是一个简单的死记硬背的过程，但是大家如果在前期能够通过一段时间的准备，在备考相应的话题和准备论据等等方面的时候就会轻松很多。所以大家可以从最基本的内容入手准备。