下表为某年我国东部季风区某河流下游河段水运交通各月旅客发送量统计表。据此完成下面小题。                                                                                                                                                                                                                                                                  

月份	1	2	3	4	5	6
发送量(万人)	0	0	0	0	15.6	26.9
月份	7	8	9	10	11	12
发送量(万人)	30.3	38	24.3	21.2	0	0