In het postcodegebied 1931 is het aantal inwoners sinds 1998 als volgt opgebouwd :
| Jaar | Inwoners | Groei |
| 1998 | 5,185 | |
| 1999 | 5,105 | -1.54% |
| 2000 | 5,125 | 0.39% |
| 2001 | 5,135 | 0.20% |
| 2002 | 5,110 | -0.49% |
| 2003 | 5,035 | -1.47% |
| 2004 | 4,965 | -1.39% |
| 2005 | 5,095 | 2.62% |
| 2006 | 5,045 | -0.98% |
| 2007 | 5,030 | -0.30% |
| 2008 | 5,010 | -0.40% |
| 2009 | 4,980 | -0.60% |
| 2010 | 4,930 | -1.00% |
| 2011 | 4,895 | -0.71% |
| .2012 | 4,860 | -0.72% |
| 2013 | 4,800 | -1.23% |
| 2014 | 4,725 | -1.56% |
| 2015 | 4,685 | -0.85% |
| 2016 | 4,650 | -0.75% |
| 2017 | 4,655 | 0.11% |
| 2018 | 4,640 | -0.32% |
| 2019 | 4,620 | -0.43% |
| 2020 | 4,560 | -1.30% |