Characteristics of the four networks (Backbone, Frequent, Intermediate, Occasional) and the Overall one in the two periods of the year (January-August, September-December).
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Characteristics are summarized by species involved, means of transportation, national or not and reason of the movement (types of activity at origin and destination). Volume is expressed in million heads. Percentage referred to the volume specific of the period.
创建时间：
2018-01-25
