年別,_id,生母生育平均年齡
93,1,28.4
94,2,28.6
95,3,28.9
96,4,29.2
97,5,29.6
98,6,30
99,7,30.4
100,8,30.5
101,9,30.7
102,10,31
103,11,31.18
104,12,31.34
105,13,31.52
106,14,31.61
107,15,31.69
108,16,31.86
109,17,31.96
110,18,32.03
111,19,32.1