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:
08 表8:16个重点城市住宅土地供应对比表(单位:万平米) 
表格:
| 城市 | 本期 | 上期 | 去年同期 | 本年累计 | 去年累计 | 11年H2 | 11年H1 | 10年H2 | 本期环比 | 本期同比 | 累计同比 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 北京 | 0.0 | 0.0 | 0.0 | 164.0 | 268.0 | 89.0 | 33.0 | 83.0 | None | None | -39.0 |
| 上海 | 0.0 | 7.0 | 19.0 | 174.0 | 561.0 | 93.0 | 49.0 | 108.0 | -100.0 | -100.0 | -69.0 |
| 广州 | 0.0 | 0.0 | 24.0 | 0.0 | 24.0 | 16.0 | 15.0 | 9.0 | None | -100.0 | -100.0 |
| 深圳 | 3.0 | 0.0 | 0.0 | 100.0 | 178.0 | 51.0 | 14.0 | 39.0 | None | None | -44.0 |
| 杭州 | 9.0 | 0.0 | 5.0 | 207.0 | 257.0 | 39.0 | 26.0 | 38.0 | None | 75.0 | -20.0 |
| 一线汇总 | 13.0 | 7.0 | 49.0 | 645.0 | 1289.0 | 288.0 | 137.0 | 276.0 | 88.0 | -74.0 | -50.0 |
| 天津 | 10.0 | 77.0 | 28.0 | 400.0 | 815.0 | 144.0 | 70.0 | 84.0 | -87.0 | -64.0 | -51.0 |
| 重庆 | 359.0 | 198.0 | 93.0 | 2243.0 | 992.0 | 281.0 | 101.0 | 183.0 | 81.0 | 287.0 | 126.0 |
| 成都 | 69.0 | 17.0 | 162.0 | 1225.0 | 1028.0 | 101.0 | 97.0 | 93.0 | 303.0 | -57.0 | 19.0 |
| 武汉 | 0.0 | 0.0 | 120.0 | 1444.0 | 1244.0 | 125.0 | 127.0 | 229.0 | None | -100.0 | 16.0 |
| 南京 | 0.0 | 5.0 | 0.0 | 254.0 | 385.0 | 61.0 | 38.0 | 55.0 | None | -100.0 | -34.0 |
| 沈阳 | 139.0 | 198.0 | 74.0 | 1326.0 | 1322.0 | 219.0 | 117.0 | 122.0 | -29.0 | 90.0 | 0.0 |
| 大连 | 0.0 | 55.0 | 323.0 | 507.0 | 1673.0 | 101.0 | 159.0 | 374.0 | -100.0 | -100.0 | -70.0 |
| 青岛 | 164.0 | 44.0 | 30.0 | 490.0 | 215.0 | 43.0 | 24.0 | 30.0 | 273.0 | 455.0 | 128.0 |
| 苏州 | 78.0 | 27.0 | 17.0 | 462.0 | 349.0 | 97.0 | 39.0 | 6.0 | 189.0 | 374.0 | 32.0 |
| 宁波 | 58.0 | 39.0 | 0.0 | 340.0 | 218.0 | 47.0 | 21.0 | 34.0 | None | 49.0 | 56.0 |
| 厦门 | 0.0 | 0.0 | 0.0 | 0.0 | 70.0 | 12.0 | 5.0 | 29.0 | None | None | -100.0 |
| 二线汇总 | 877.0 | 660.0 | 845.0 | 8691.0 | 8311.0 | 1230.0 | 798.0 | 1239.0 | 33.0 | 4.0 | 5.0 |
| 整体汇总 | 890.0 | 667.0 | 894.0 | 9336.0 | 9599.0 | 1518.0 | 935.0 | 1516.0 | 33.0 | 0.0 | -3.0 |
问题:
美女，你好，是这样，这个住宅土地供应啊，本期环比大于0或者本期同比也大于0，你看，能不能帮我查查累计同比平均值
Answer:
-0.5