obs,I,dgdp
1960,5.368,-0.445
1961,9.856,2.288
1962,4.517,2.13
1963,4.277,-0.454
1964,2.726,0.36
1965,7.047,1.027
1966,4.725,2.644
1967,6.629,2.491
1968,3.444,-0.969
1969,5.292,4.002
1970,7.294,2.482
1971,5.062,1.458
1972,4.097,3.005
1973,8.867,3.476
1974,6.624,0.797
1975,1.744,-0.143
1976,7.56,0.548
1977,0.605,-0.03
1978,6.511,2.807
1979,7.834,0.273