| 1985 database | 1995 database | 2005 database | 2015 database |
Mean | 2307.57 | 4507.42 | 5226.74 | 5019.21 |
Standard deviation | 1186.04 | 2619.29 | 2557.09 | 1797.37 |
10th percentile | 1220.83 | 2023.82 | 2598.57 | 2854.18 |
50th percentile | 2072.26 | 4117.99 | 4869.93 | 4839.32 |
90th percentile | 3627.10 | 7188.94 | 8004.57 | 7182.37 |