| Time Period | Minimum | 25th Percentile | Median | Average | 75th Percentile | Maximum | Standard Deviation |
|---|---|---|---|---|---|---|---|
| 2004-2008 | 0.54 | 0.87 | 0.97 | 1.00 | 1.09 | 2.06 | 0.19 |
| 2009-2013 | 0.53 | 0.85 | 0.95 | 0.97 | 1.06 | 2.00 | 0.18 |
| 2014-2018 | 0.52 | 0.80 | 0.90 | 0.92 | 1.00 | 1.87 | 0.17 |
| Total | 0.52 | 0.84 | 0.94 | 0.96 | 1.05 | 2.06 | 0.18 |