=========================== 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

