BeginPackage["Wikicode`Arsenic`"]
Production::usage = "Production[date] gives the annual world arsenic \
production from the specified date."
Begin["`Private`"]
Production[from_Integer] :=
Select[arsenicData["Production"],
DateDifference[{from}, #[[1]]] >= 0 &]
arsenicData["Production"] =
MapAt[{Round@#} &, #, 1] & /@
Import["http://minerals.usgs.gov/ds/2005/140/ds140-arsen.xlsx"][[1,
6 ;; -4, {1, 10}]]
End[]
EndPackage[]
