| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.92 | 0.98 | 1.01 | 1.01 | 1.04 | 1.12 | 0.04 |
| 2009-2013 | 0.91 | 0.97 | 1.01 | 1.01 | 1.04 | 1.13 | 0.04 |
| 2014-2018 | 0.89 | 0.95 | 0.98 | 0.98 | 1.00 | 1.08 | 0.03 |
| Total | 0.89 | 0.97 | 1.00 | 1.00 | 1.03 | 1.13 | 0.04 |