| Average annual change (meter per years) | ||||||||
| Sector 1 | Sector 2 | Sector 3 | Sector 4 | Sector 5 | Sector 6 | Sector 7 | Sector 8 | |
| 1988 to 2000 | −4.35 | −6.01 | −4.89 | −2.92 | −2.09 | −4.87 | −3.75 | −2.75 |
| 2000 to 2013 | −3.01 | −4.24 | −4.81 | −2.83 | −2.16 | −3.98 | −2.91 | −1.91 |
| 2013 to 2018 | −8.52 | −6.51 | −5.21 | −2.92 | −2.21 | 4.88 | 1.09 | 1.09 |
| 1988 to 2018 | −5.29 | −5.59 | −4.97 | −2.89 | −2.15 | −1.99 | −2.52 | −1.86 |