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:
81 表6：天津住宅期房2007-2012年1月各月成交面积（万平）              
表格:
| 时间 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 2007.0 | 62.0 | 29.0 | 56.0 | 67.0 | 71.0 | 76.0 | 218.0 | -- | 129.0 | 92.0 | 96.0 | 80.0 |
| 2008.0 | 43.0 | 21.0 | 53.0 | 47.0 | 51.0 | 49.0 | 40.0 | 32 | 33.0 | 43.0 | 49.0 | 42.0 |
| 2009.0 | 29.0 | 57.0 | 124.0 | 108.0 | 128.0 | 116.0 | 134.0 | 143 | 122.0 | 109.0 | 124.0 | 135.0 |
| 2010.0 | 86.0 | 37.0 | 89.0 | 108.0 | 63.0 | 50.0 | 63.0 | 71 | 95.0 | 112.0 | 115.0 | 134.0 |
| 2011.0 | 90.0 | 104.0 | 62.0 | 46.0 | 81.0 | 76.0 | 84.0 | 86 | 92.0 | 74.0 | 45.0 | 46.0 |
问题:
天津住宅期房成交面积在1月份和2月份都高于50万平发生在什么时候
Answer:
2011.0