Year | Mean | Mann-Whitney U | Wilcoxon | Z-Statistics | Asymptotic Significant (2 Tailed) | Sen’s Estimator | Number of Samples |
1971-1980 1981-1990 | 8.8 12.2 | 33 | 88 | −1.285 | 0.199 | 1.437 | 10 10 |
1991-2000 2001-2010 | 11 10 | 45 | 100 | −0.378 | 0.705 | −0.0232 | 10 10 |