Appendix 1

　

Calculation of average sulphur content

　

Note: wherever “all deliveries“ are mentioned, this is meant to refer to all deliveries sampled and tested for sulphur and being taken into account for the purpose of monitoring.

　

Calculation not weighted for quantity

　

　

in which:

　

A_cj= the average sulphur content of all deliveries sampled world wide in year j

　

a_i= the sulphur content of individual sample for delivery i

　

N_j= total number of samples taken in year j

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