Since 1 January 2017, only middle rates were published; see BBEX3:D:COP:USD:CA:AC:000.
Source
Since April 2003: Superintendencia Financiera de Colombia, Bogotá, D.C. (formerly: Superintendencia Bancaria de Colombia). 1994 - March 2003: Dresdner Bank Lateinamerika AG, Hamburg (formerly: Deutsch-Südamerikanische Bank AG).