GTSPP Data Product Centre| Year & Month(yyyymm) | observing line | Number of observations |
|---|---|---|
| 201211 | PX40 | 186 |
| 201301 | PX40 | 161 |
| 201307 | PX40 | 177 |
| 201312 | PX40 | 172 |
| 201402 | PX40 | 191 |
| 201405 | PX40 | 178 |
| 201406 | PX40 | 199 |
| 201408 | PX40 | 188 |
| 201411 | PX40 | 183 |
| 201501 | PX40 | 191 |
| 201504 | PX40 | 201 |
| 201506 | PX40 | 192 |
| 201509 | PX40 | 185 |