GTSPP Data Product Centre| Year & Month(yyyymm) | observing line | Number of observations |
|---|---|---|
| 201009 | PX11 | 41 |
| 201011 | PX11 | 40 |
| 201103 | PX11 | 45 |
| 201107 | PX11 | 3 |
| 201109 | PX11 | 38 |
| 201204 | PX11 | 18 |
| 201207 | PX11 | 49 |
| 201209 | PX11 | 26 |
| 201303 | PX11 | 44 |
| 201306 | PX11 | 45 |
| 201308 | PX11 | 43 |
| 201310 | PX11 | 12 |
| 201312 | PX11 | 46 |
| 201403 | PX11 | 26 |
| 201405 | PX11 | 49 |
| 201407 | PX11 | 30 |