production of sulfuric acid in some countries from 1970 to 2003
<a href="//commons.wikimedia.org/wiki/User:Orci" title="User:Orci">Orci</a>
2008-03-23
own work, source: <a rel="nofollow" class="external text" href="http://unstats.un.org/unsd/cdb/cdb_series_xrxx.asp?series_code=18150">United Nations Statistics Division</a>