Antal tomme enheder (fragttype: underkategori 3X, 31, 32, 33, 34, 5X, 51, 59, 6X, 61, 64, 65, 66 og 69).
Number of units without cargo (type of cargo: subcategories 3X, 31, 32, 33, 34, 5X, 51, 59, 6X, 61, 64, 65, 66 and 69).