There are 18 years of data available from 2001 - 2018. Consequently, for a specific day of the year 18 past observations can be extracted. For the EPC +/- 5 days around the considered day are additionally included. This results in an ensemble of 18*(2*5+1) = 198 member.
An example of a graphical representation of the EPC, generated under EPC World and EPC Cities is displayed and explained below: