| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.85 | 1.00 | 1.05 | 1.05 | 1.10 | 1.38 | 0.07 |
| 2009-2013 | 0.77 | 0.92 | 0.97 | 0.97 | 1.02 | 1.25 | 0.07 |
| 2014-2018 | 0.76 | 0.91 | 0.96 | 0.96 | 1.01 | 1.24 | 0.07 |
| Total | 0.76 | 0.93 | 0.99 | 1.00 | 1.05 | 1.38 | 0.08 |