A.There might be a tendency of decreasing in the future.
B.The tendency would be continuing because…
C.Over the period from 1200 to 1300, the trend was towards a decrease in A, while there was an upward trend in B. There was a dramatic fall in A from 1205. However, from the year 1230 on, the rate of decrease slowed down and there was a more gradual reduction in A, reaching a figure of 10,000 in 1270. The number in B rose steadily, reaching 2000 in 1210, to a peak of 4000 in 1290.
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可以采用下面几个，是我自己以前用的：
A.There might be a tendency of decreasing in the future.
B.The tendency would be continuing because…
C.Over the period from 1200 to 1300, the trend was towards a decrease in A, while there was an upward trend in B. There was a dramatic fall in A from 1205. However, from the year 1230 on, the rate of decrease slowed down and there was a more gradual reduction in A, reaching a figure of 10,000 in 1270. The number in B rose steadily, reaching 2000 in 1210, to a peak of 4000 in 1290.