BeginPackage["Wikicode`Magnesium`"]
Production::usage="Production[date] gives the annual world magnesium production from the specified date."
Begin["`Private`"]
Production[from_Integer]:=Select[magnesiumData["Production"],DateDifference[{from},#[[1]]] >= 0&]
magnesiumData["Production"] =
MapAt[{Round@#} &, #, 1] & /@
Import["http://minerals.usgs.gov/ds/2005/140/ds140-mgmet.xlsx"][[1,
28 ;; 102, {1, 11}]]
End[]
EndPackage[]
