请阅读下面这张Markdown格式的表格并回答问题。同一行中不同列的单元格用'|'分隔，不同行的单元格用'
'分隔。

表格标题:
62 表1：重点城市周成交数据1（万平米、元） 
表格:
| 城市 | 上周成交量绝对量 | 上周成交量同比 | 上周成交量同比11年 | 上周成交量同比10年 | 前周成交量 | 前周成交量环比 | 前周成交量同比11年 | 月初以来周平均成交量 | 月初以来周平均成交量环比 | 月初以来周平均成交量同比11年 | 月初以来周平均成交量同比10年 | 年初至今成交量 | 年初至今成交量较11年 | 年初至今成交量较10年 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 总计 | 406.49 | -5.0 | 28.0 | 64.0 | 429.47 | -1.0 | 40.0 | 402.41 | 17.0 | 37.0 | 58.0 | 6653.0 | -4.0 | -10.0 |
| 一线城市 | 74.32 | 0.3 | 26.0 | 58.0 | 74.08 | -4.0 | 21.0 | 71.48 | 29.0 | 16.0 | 86.0 | 1159.0 | -12.0 | -13.0 |
| 二线城市 | 200.34 | -7.0 | 34.0 | 78.0 | 214.67 | 3.0 | 48.0 | 196.03 | 13.0 | 50.0 | 62.0 | 3297.0 | 5.0 | -3.0 |
| 三线城市 | 131.83 | -6.0 | 21.0 | 49.0 | 140.72 | -4.0 | 41.0 | 134.91 | 19.0 | 34.0 | 41.0 | 2197.0 | -11.0 | -19.0 |
| 北京 | 21.75 | 6.0 | 81.0 | 217.0 | 20.47 | 14.0 | 92.0 | 18.4 | 50.0 | 67.0 | 136.0 | 226.0 | -9.0 | -35.0 |
| 上海 | 23.13 | 7.0 | -13.0 | 5.0 | 21.67 | -16.0 | -17.0 | 22.77 | 8.0 | -8.0 | 32.0 | 481.0 | -18.0 | -14.0 |
| 深圳 | 10.36 | 41.0 | 178.0 | 193.0 | 7.34 | 19.0 | 79.0 | 6.9 | 14.0 | 21.0 | 159.0 | 119.0 | -2.0 | 2.0 |
| 广州 | 19.08 | -22.0 | 15.0 | 30.0 | 24.6 | -8.0 | 20.0 | 23.42 | 45.0 | 17.0 | 118.0 | 332.0 | -9.0 | 7.0 |
| 杭州 | 21.48 | 1.0 | 80.0 | 913.0 | 21.34 | 34.0 | 83.0 | 18.42 | 15.0 | 66.0 | 574.0 | 265.0 | 21.0 | 110.0 |
| 苏州 | 32.77 | 10.0 | 212.0 | 587.0 | 29.83 | -12.0 | 182.0 | 30.57 | 23.0 | 242.0 | 729.0 | 479.0 | 141.0 | 146.0 |
| 南京 | 13.67 | -6.0 | 89.0 | 94.0 | 14.52 | 7.0 | 39.0 | 13.77 | 2.0 | 87.0 | 155.0 | 245.0 | 31.0 | 6.0 |
| 宁波 | 6.36 | -29.0 | 17.0 | 51.0 | 8.98 | -3.0 | 46.0 | 7.01 | 30.0 | 35.0 | 82.0 | 118.0 | -23.0 | -15.0 |
| 天津 | 17.78 | 3.0 | -13.0 | 35.0 | 17.29 | -2.0 | -9.0 | 18.0 | 25.0 | 2.0 | 23.0 | 267.0 | -34.0 | -33.0 |
| 青岛 | 4.35 | -51.0 | -73.0 | -77.0 | 8.83 | -42.0 | -51.0 | 9.45 | 8.0 | -39.0 | -49.0 | 193.0 | -43.0 | -40.0 |
| 重庆 | 43.86 | 7.0 | 70.0 | 71.0 | 41.06 | 10.0 | 47.0 | 38.21 | -11.0 | 53.0 | 36.0 | 821.0 | 27.0 | -8.0 |
| 成都 | 19.0 | -7.0 | 52.0 | 74.0 | 20.38 | -1.0 | 109.0 | 17.8 | 18.0 | 82.0 | 26.0 | 303.0 | -11.0 | -13.0 |
| 厦门 | 9.95 | -6.0 | 35.0 | 245.0 | 10.53 | -29.0 | 127.0 | 11.07 | 41.0 | 108.0 | 303.0 | 145.0 | 58.0 | 28.0 |
| 东莞 | 11.67 | -21.0 | -19.0 | 133.0 | 14.75 | 26.0 | 37.0 | 11.38 | 34.0 | 1.0 | 106.0 | 165.0 | -31.0 | -3.0 |
| 西安 | 19.45 | -28.0 | 13.0 | 9.0 | 27.16 | 43.0 | 68.0 | 20.37 | 21.0 | 47.0 | -6.0 | 296.0 | -5.0 | -34.0 |
| 福州 | 7.66 | 70.0 | 138.0 | 301.0 | 4.5 | 21.0 | 89.0 | 5.35 | 59.0 | 93.0 | 164.0 | 71.0 | -12.0 | -29.0 |
| 温州 | 1.67 | -63.0 | -3.0 | 12.0 | 4.52 | 0.0 | 546.0 | 3.06 | 49.0 | 216.0 | 120.0 | 35.0 | -34.0 | -60.0 |
| 无锡 | 14.45 | 29.0 | 85.0 | 233.0 | 11.18 | -20.0 | 98.0 | 12.31 | 49.0 | 92.0 | 170.0 | 187.0 | 26.0 | -12.0 |
| 徐州 | 11.48 | -19.0 | -25.0 | -16.0 | 14.16 | 8.0 | 29.0 | 12.06 | 17.0 | 11.0 | 6.0 | 217.0 | -29.0 | -19.0 |
| 扬州 | 2.72 | -20.0 | 57.0 | -14.0 | 3.39 | 5.0 | 16.0 | 3.0 | 31.0 | 1.0 | -2.0 | 58.0 | -19.0 | -30.0 |
| 惠州 | 6.9 | 50.0 | 55.0 | 176.0 | 4.59 | -50.0 | -37.0 | 7.23 | 12.0 | 21.0 | 105.0 | 120.0 | -1.0 | 15.0 |
| 蚌埠 | 3.23 | 25.0 | -17.0 | 230.0 | 2.59 | -13.0 | 36.0 | 2.82 | 9.0 | -3.0 | 59.0 | 50.0 | -30.0 | 12.0 |
| 汕头 | 1.45 | 61.0 | -38.0 | 45.0 | 0.9 | -24.0 | -44.0 | 1.22 | -14.0 | -30.0 | 18.0 | 30.0 | -45.0 | 11.0 |
| 昆明 | 13.65 | -9.0 | 21.0 | 96.0 | 14.93 | -3.0 | 35.0 | 13.92 | 65.0 | 14.0 | 132.0 | 200.0 | -43.0 | -20.0 |
| 连云港 | 8.97 | -17.0 | -2.0 | 152.0 | 10.77 | -3.0 | 16.0 | 9.75 | 42.0 | -2.0 | 63.0 | 159.0 | -17.0 | -10.0 |
| 长沙 | 32.62 | -20.0 | 42.0 | 26.0 | 40.62 | 15.0 | 94.0 | 34.47 | 28.0 | 62.0 | 32.0 | 489.0 | 14.0 | -21.0 |
| 贵阳 | 9.9 | -5.0 | -2.0 | -2.0 | 10.43 | -14.0 | 1.0 | 11.9 | -39.0 | 26.0 | -23.0 | 308.0 | 30.0 | 17.0 |
| 海口 | 7.17 | 27.0 | 246.0 | 285.0 | 5.65 | -18.0 | 212.0 | 5.94 | 32.0 | 213.0 | 419.0 | 90.0 | 10.0 | -57.0 |
| 包头 | 5.2 | -17.0 | -41.0 | -18.0 | 6.27 | -24.0 | -18.0 | 6.87 | 3.0 | -6.0 | -13.0 | 98.0 | -24.0 | -30.0 |
| 南充 | 4.76 | -23.0 | 16.0 | 5.0 | 6.22 | 18.0 | 16.0 | 5.04 | 28.0 | 18.0 | 7.0 | 88.0 | -41.0 | -28.0 |
问题:
请问北京月初以来它的周平均成交量和环比分别是多少？
Answer:
18.4, 50.0