I will quote you as argument during the negotiations 
That is if you’re really worth it…
There is NO common salary increase when leaving a company. Ever. You switch jobs because you’re unhappy with your present situation or you get a better offer.
You got a better offer. Let it be known.
If really unhappy about your present situation, I’d consider the new post. It might also trigger some négociations with your present company… if they’re happy with you.
Careful there: you seem to have of a very high opinion of yourself. It might not be the case for your colleagues and supervisors. As in glad to see him go, go, go.
NB. If you’re Indian or Tamil, it’s a very common trait of character (“I’m a Bramhani, I am worth more”) and this type of behaviour is really disliked here. Sorry if this offended you.
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what is your background? like bachelor or master, PMP, certifications?
then i can answer cause i was in a similar situation (project manager myself)
Try to find out consulting dayrates for project management, you’ll see my point