cross section regression per period

[op313]

Hello, for 20 countries I've a time series of 90 years. Each country has GDP and 4 attributes.
I have this in a panel structure in eviews.
I need to run 90 regressions of GDP on the 4 attributes:
year1 use the observations of the 20 countries for year1
...
year90 use the observations of the 20 countries for year90.

and then collect the 90yr time series of the r2.

Is this already built in eviews? thanks