group(country_name)
Residuals
Dfits
year==1971
year==1972
year==1973
year==1974
year==1975
year==1976
year==1977
year==1978
year==1979
year==1980
year==1981
year==1982
year==1983
year==1984
year==1985
year==1986
year==1987
year==1988
year==1989
year==1990
year==1991
year==1992
year==1993
year==1994
year==1995
year==1996
year==1997
year==1998
year==1999
year==2000
year==2001
year==2002