| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.42 | 0.71 | 0.77 | 0.79 | 0.86 | 1.39 | 0.12 |
| 2009-2013 | 0.52 | 0.89 | 0.99 | 1.02 | 1.11 | 2.19 | 0.19 |
| 2014-2018 | 0.60 | 1.03 | 1.16 | 1.21 | 1.34 | 3.11 | 0.27 |
| Total | 0.42 | 0.81 | 0.97 | 1.01 | 1.15 | 3.11 | 0.27 |