| 年份 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 |
| 數目 | 1009 | 1679 | 2321 | 2433 | 3034 | 3298 | 3371 | 3598 |
| 年份 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
| 數目 | 4424 | 6404 | 6843 | 4807 | 3163 | 3174 | 2734 | 3836 |
| 年份 | 2014 | 2015 | 2016 | 2017 | 2018 | |||
| 數目 | 3917 | 3382 | 3321 | 3128 | 2937 |
備註
All figures are collected from Social Welfare Department since 1998.
