| 年份 | 乡镇个数(个） |
| 2023 | |
| 2022 | |
| 2021 | |
| 2020 | 点击查看 |
| 2019 | 点击查看 |
| 2018 | 点击查看 |
| 2017 | 19 |
| 2016 | 18 |
| 2015 | 18 |
| 2014 | 18 |
| 2013 | 18 |
| 2012 | 17 |
| 2011 | 17 |
| 2010 | 17 |
| 2010 | 17 |
| 2009 | 17 |
| 2009 | 17 |
| 2008 | 17 |
| 2008 | 17 |
| 2007 | 17 |
| 2007 | 17 |
| 2006 | 17 |
| 2006 | 17 |
| 2005 | 17 |
| 2005 | 17 |
| 2004 | 17 |
| 2004 | 17 |
| 2003 | 17 |
| 2003 | 17 |
| 2002 | 17 |
| 2002 | 17 |
| 2001 | 17 |
| 2001 | 17 |
| 2000 | 17 |
| 2000 | 17 |
| 1999 | 12 |
| 1999 | 5 |
