variable | unit | 1997 | 2000 | 2004 | 2006 | 2009 | 2011 |
|
| Mean standard deviation | Mean standard deviation | Mean standard deviation | Mean standard deviation | Mean standard deviation | Mean standard deviation |
Education years | years | 9.210 | 9.610 | 10.55 | 10.68 | 10.46 | 11.25 |
|
| (3.080) | (3.041) | (2.958) | (3.189) | (3.177) | (3.274) |
Working years | years | 20.11 | 20.36 | 21.88 | 22.70 | 23.21 | 22.32 |
|
| (10.84) | (10.88) | (10.15) | (10.21) | (10.09) | (10.08) |
Monthly salary | yuan | 376.8 | 422.4 | 668.5 | 917.0 | 1513.3 | 1959.2 |
|
| (441.4) | (816.4) | (1737.9) | (2202.9) | (3326.0) | (3545.3) |
Llogarithm of |
| 5.946 | 6.229 | 6.587 | 6.785 | 7.183 | 7.560 |
monthly wages |
| (0.565) | (0.605) | (0.583) | (0.624) | (0.646) | (0.631) |
N |
| 2609 | 2696 | 1933 | 2064 | 2344 | 3548 |