| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.77 | 0.91 | 0.95 | 0.95 | 1.00 | 1.30 | 0.07 |
| 2009-2013 | 0.71 | 0.91 | 0.99 | 0.99 | 1.08 | 1.48 | 0.12 |
| 2014-2018 | 0.63 | 0.90 | 1.04 | 1.06 | 1.20 | 1.83 | 0.20 |
| Total | 0.63 | 0.91 | 0.98 | 1.00 | 1.07 | 1.83 | 0.15 |