Number of practices and number of practices with ‘persistent high turnover’ by year
| Year | Practices (n) | Practices with persistent high turnover (%) |
| 2007 | 7798 | – |
| 2008 | 7858 | – |
| 2009 | 7946 | 211 (2.66) |
| 2010 | 8038 | 276 (3.43) |
| 2011 | 7986 | 372 (4.66) |
| 2012 | 7907 | 428 (5.41) |
| 2013 | 7795 | 559 (7.17) |
| 2014 | 7619 | 688 (9.03) |
| 2015 | 7390 | 586 (7.93) |
| 2016 | 7207 | 495 (6.87) |
| 2017 | 6956 | 411 (5.91) |
| 2018 | 6751 | 413 (6.12) |
| 2019 | 6585 | 417 (6.33) |