число уменьшилось

[Cory_ander]

Количество происшествий все еще остается высоким, хотя по сравнению с прошлым годом уменьшилось и число пострадавших, и число пожаров.

The number of accidents is still rather high, although ???

[upahill]

Although the accident rate remains high, the number of injured and fires has...

[alk]

см., например, здесь
http://www.ssb.no/vtuaar_en/
...The decrease in injury figures

или здесь
http://www.thisisscunthorpe.co.uk/crime/Casualty-figures-track-lowest-record/article-1397030-detail/article.html
THE number of people killed or seriously injured on North Lincolnshire's roads this year could be the lowest since records for the region began
...
the figure of 49 people killed or injured this year was 39 less than for the same period of 2008

[lolik]

the number has decreased

[AA3]

The accident rate remains still high, although the number of both fires and casualties is down on the last year.