BeginPackage["Wikicode`Salt`"]
Production::usage = "Production[date] gives the annual world salt production from \
the specified date."
Begin["`Private`"]
saltData["Production"] =
MapAt[{Round@#} &, #, 1] & /@
Import["http://minerals.usgs.gov/ds/2005/140/ds140-salt.xlsx"][[1,
19 ;; 117, {1, 8}]];
Production[from_Integer] :=
Select[saltData["Production"],
DateDifference[{from}, #[[1]]] >= 0 &]
End[]
EndPackage[]
