I did find these two files. They seem to be official, but they are informing different values for the conversion:
www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=7&gpiType=N&file=NPI2011-010.pdf&eoq=36870
up7.iranblog.com/images/468q6xek7ht8f0aghxa5.pdf