Recovering Last Available Observation Per country Stata

I am trying to only keep the last available observation for each variable, however, the issue is that different variables per country were measured in different years. My data currently looks like this:

iso3c year  Gini          variable1         variable2                variable3
AND   2000       .          1.279314         33                        22
AND   2001      22          2.571869         .                          .
AND   2002       .          3.492054         .                          .
AND   2003      44          3.89996          .                           

This is my code:

gsort + iso3c - year
drop if Gini==. & variable1==.      &     variable2==.       &       variable3==.
bysort iso3c: keep if _n==1 
drop year

I tried this with one variable as in below, and then ran the other lines and it worked well.

drop if Gini==. 

However, because I have different variables measured in different years per country, Stata ends up only keeping the following:

iso3c Gini     variable1            variable2            variable3

AND    44           3.89996          .                   .                               

However, I want something like this, where the last available observation for variables 2 and 3 are also kept from the year 2000 even though the variables were not measured in 2004.

iso3c Gini      variable1            variable2                variable3

AND    44           3.89996          33                        22