Volume bate added to GiE natural gas storage codes

The following codes have had a volume 'w' bate added in addition to the unspecified 'u' bate that was originally assigned.

Effective Friday August 15, 2014. Data currently under 'u' bate will be copied to the newly created 'w' bate.

With effect from Monday August 18, 2014 and going forwards the volume 'w' bate will be populated and the unspecified 'u' bate will no longer be used.