Filter data

[Pomna]

Hello Experts below is my set expression which gives me the number of contacts each year but I would like to know the new contacts each year. That is, for each year I would like to filter out all contacts which are appearing for the first time. I would like to know the new contacts for every year

=if(IsNull(GetFieldSelections([Contacted By])),
Count({$<[Assigned Flag]={'Y'},CRTeamFlagContact={'Y'}>}Distinct [Contact Name]),
Count({$<[Assigned Flag]={'Y'},[Assigned RDM]={'$(=[Contacted By])'}>}Distinct [Contact Name]))

[Vegar]

I focused on your if=true() expression in my answer. 

Assuming you got the field Year in your data model then you can use this.

=Count({$<
   [Contact Name]=E({<Year={'$(=Max(Year)-1)'}>} [Contact Name]),
   Year={'$(=Max(Year))'},
   [Assigned Flag]={'Y'},CRTeamFlagContact={'Y'}
    >}Distinct [Contact Name])

See even attached QVF file