| Year | Number of Retirements |
|---|---|
| 2006 | 1,212 |
| 2007 | 1,614 |
| 2008 | 1,473 |
| 2009 | 4,749 |
| 2010 | 1,224 |
| 2011 | 2,947 |
| 2012 | 1,396 |
| 2013 | 1,972 |
| 2014 | 2,199 |
| 2015 | 2,106 |
| 2016 | 2,535 |
| 2017 | 1,485 |
| 2018 | 1,674 |
| 2019 | 2,070 |
| 2020 | 2,056 |
| 2021 | 2,656 |
| 2022 | 4,813 |
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