| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.44 | 0.60 | 0.66 | 0.67 | 0.72 | 1.39 | 0.11 |
| 2009-2013 | 0.60 | 0.83 | 0.91 | 0.92 | 0.99 | 1.87 | 0.16 |
| 2014-2018 | 0.76 | 1.05 | 1.16 | 1.17 | 1.26 | 2.36 | 0.20 |
| Total | 0.44 | 0.70 | 0.90 | 0.92 | 1.10 | 2.36 | 0.26 |