A Mandarin passage about the economy includes the sentence: '由于贸易摩擦加剧，两国之间的外贸额在过去一年中下降了近15%。' (Due to escalating trade friction, the total foreign trade volume between the two countries declined by nearly 15% over the past year.) What is the main point of this sentence?
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A
Trade between the two countries increased by 15% due to improved bilateral relations
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B
Trade friction caused a significant decrease in bilateral trade volume
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C
The countries fully resolved their trade disputes within the past year
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D
One country imposed a 15% tariff on the other's exported goods