| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.57 | 0.90 | 1.00 | 1.02 | 1.11 | 3.17 | 0.19 |
| 2009-2013 | 0.59 | 0.91 | 1.00 | 1.03 | 1.12 | 3.56 | 0.20 |
| 2014-2018 | 0.58 | 0.89 | 0.98 | 1.01 | 1.10 | 3.24 | 0.20 |
| Total | 0.57 | 0.90 | 0.99 | 1.02 | 1.11 | 3.56 | 0.20 |