The year 1850 is used because historians and economists prefer round numbers The source says As exporta es brasileiras triplicavam as da Argentina em 1850 segundo c lculos de Bulmer Thomas Em termos internacionais mais amplos o valor absoluto das exporta es brasileiras era o mais elevado da Am rica Latina enquanto o da Argentina ocupava o quarto lugar In English The Brazilian exports were the triple of Argentina s in 1850 according to calculations by Bulmer Thomas In more ample international terms the absolute value of Brazilian exports were the highest in Latin America while Argentine held the fourth place The book was written by the Brazilian historian Boris Fausto and the Argentine historian Fernando J Devoto It s a comparative history of Brazil and Argentina from 1850 until 2002 I used the edition in Portuguese There is an edition in Spanish Argentina y Brasil 1850 2000 un Ensayo de Historia Comparada published by Sudamericana Buenos Aires Of course if anyone has data regarding other years I would be glad to see them They would be useful in Economy of the Empire of Brazil