| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.72 | 1.04 | 1.13 | 1.13 | 1.21 | 1.59 | 0.12 |
| 2009-2013 | 0.82 | 0.96 | 1.00 | 1.00 | 1.05 | 1.25 | 0.07 |
| 2014-2018 | 0.80 | 0.91 | 0.95 | 0.95 | 0.99 | 1.15 | 0.06 |
| Total | 0.72 | 0.94 | 1.00 | 1.03 | 1.09 | 1.59 | 0.11 |