BeginPackage["Wikicode`Gemstone`"]
Production::usage="Production[date] gives the annual world gemstone production from the specified date."
Begin["`Private`"]
Production[from_Integer]:=Select[gemstoneData["Production"],DateDifference[{from},#[[1]]] >= 0&]
gemstoneData["Production"] =
MapAt[{Round@#} &, #, 1] & /@
Import["http://minerals.usgs.gov/ds/2005/140/ds140-gemst.xlsx"][[1,
61 ;; 117, {1, 8}]]
End[]
EndPackage[]
