Regina Cella Cati, Marcio G. P. Garcia, and Pierre Perron, "Unit Roots in the Presence of Abrupt Governmental Interventions with an Application to Brazilian Data", Journal of Applied Econometrics, Vol. 14, No. 1, 1999, pp. 27-56. The file inf-b.dat contains monthly Brazilian inflation rate series from 1974:1 to 1993:6, one line per observation. Please refer to the paper for the exact source and construction of this series.