| DTR | ||
| Changes | 1971-2000 | 1981-2010 |
| Positives | 155 | 109 |
| Negatives | 79 | 44 |
| Total | 234 | 153 |
| Average | 1.26 | 1.27 |
| Standard Deviation | 3.29 | 2.87 |
| Maximum | 15 | 11.02 |
| Minimum | −10 | −13.42 |
| % Increment | 66.24 | 71.24 |
| % Diminution | 33.76 | 28.76 |