=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 18-Jan-2012
Using data from the latest UHSLC JASL cd the 'METRIC' dataset was updated. Data
values 1992-2007 were added to the dataset.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 15-Oct-2013
Complete dataset 1990-2012 added using UHSLC data

