| 年份 | 自然增长率 |
| 2023 | |
| 2022 | |
| 2021 | |
| 2020 | |
| 2020 | |
| 2019 | |
| 2019 | |
| 2018 | |
| 2018 | |
| 2017 | |
| 2017 | |
| 2016 | |
| 2016 | |
| 2015 | |
| 2015 | |
| 2014 | |
| 2014 | |
| 2013 | |
| 2013 | |
| 2012 | |
| 2012 | |
| 2011 | 0.25 |
| 2011 | 0.25 |
| 2010 | 0.11 |
| 2010 | 0.11 |
| 2009 | 0.12 |
| 2009 | 0.12 |
| 2008 | 0.11 |
| 2008 | 0.11 |
| 2007 | 0.04 |
| 2007 | 0.04 |
| 2006 | -0.06 |
| 2006 | -0.06 |
| 2005 | -0.12 |
| 2005 | -0.12 |
| 2004 | -0.24 |
| 2004 | -0.24 |
| 2003 | -0.28 |
| 2003 | -0.28 |
| 2002 | -0.21 |
| 2002 | -0.21 |
| 2001 | -0.32 |
| 2001 | -0.32 |
| 2000 | -0.21 |
| 2000 | -0.21 |
| 1999 |
