i think i've founded a solution:
Provider1V: It's values for Provider1
The idea is to create 2 marks:
The first one, only to show Provider1's values
And the second one to calculate the %delta:
ProviderDelta to filter 2 parameters
Configure the %delta table calculation by ProviderDelta and the option "Relativo a" - Relative to in english maybe as Provider1, So the calculation is always done over Provider1, You'll need to do that twice (marks and column)
I am going to try this and post an update with how this goes later today. Thanks!