EN: Il y a eu d'importantes hausses

[LeMarie]

Hello,
I would like to say: Il y a eu d'importantes hausses l'année dernière sur ce produit....but I don't manage to find the right sentence.
présent: There are important increases regarding this product
past: Last year, There were important increase regarding this product...
J'ai l'impression que were n'est pas le bon temps?
Thanks a lot for your help...

 

[LeMarie]

Thanks for your help
Take care

 

[dratuor]

heuu non...

Here 'important' should be translated by 'major'
there was major increase...

To be more natural the sentence should be phrased the other way round.

What did increase?

i.e: Sales of this product increased last year...

If you have more context it can help

 

[LeMarie]

Thanks Dratuor for your help...
I've just checked to my dictionary and "significant" is (perhaps) more appropriate for this sentence.
It's regarding raw materials increases.