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but my professor have showed me that it can be interpolated .
So. I just want to know why I followed the step to do the interpolation but nothing changes?

No, the series starts from 1997Q1 (NA)

Can this situation(the attachment )be interpolated?

How are you interpolating?

"Open up the series ---> Proc--->interpolate --->choose log-linear method -->press OK "

but there is nothing changes for NA

I have some problems about interpolation It works when the missing value (NA) has the previous and next observations. is this kind of series like as the attachment possible to interpolate? Doesn't need to have the previous and next observation for the missing value if we want to interpolate it ? if ...