Missing number is 6. All opposite numbers add up to 21.
2
本年刊部分指标合计数或相对数,由于四舍五入关系或核算单位不同,分项数字之和可能会与之有所出入。
VI. Due to rounding or different accounting unit, the amount of separate number may not correspond with the aggregative or relative ones in this yearbook.