Bonjour,
je fais une rédaction en anglais, et je bloque sur le present perfect.
Voici les phrases où j'hésite à l'utiliser:

[...]the last year which have attracted 628 432 people then than in 2006 only 500 000 people have visited it, that is to say a considerable subsidence of 20% of number of visitor in comparison with the year 2005.

[...]in 2005 the Show have taken the census a fall of 11% owing to snow storm which have blocked the motorists circulation.

Accordingly The Show agriculture enregistered a fall of 30% in two years in comparison with in 2004, where 700 021 visitors came at the occasion of this moment.

Merci d'avance