| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.92 | 0.96 | 0.97 | 0.97 | 0.99 | 1.08 | 0.02 |
| 2009-2013 | 0.91 | 0.99 | 1.00 | 1.00 | 1.02 | 1.08 | 0.02 |
| 2014-2018 | 0.89 | 1.00 | 1.02 | 1.01 | 1.03 | 1.12 | 0.03 |
| Total | 0.89 | 0.97 | 1.00 | 1.00 | 1.02 | 1.12 | 0.03 |