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 99,7,30.4 100,8,30.5 101,9,30.7 102,10,31 103,11,31.18 104,12,31.34 105,13,31.52 106,14,31.61 107,15,31.69 108,16,31.86 109,17,31.96 110,18,32.03 111,19,32.1 112,20,32.24