| Year | Participants | No. of dropouts | Stage of first dropout |
|---|---|---|---|
| 2019 | 129 | 20 | 1 |
| 2018 | 151 | 7 | 2 |
| 2017 | 147 | 14 | 2 |
| 2016 | 140 | 15 | 1 |
| 2015 | 128 | 15 | 2 |
| 2014 | 139 | 13 | 2 |
| 2013 | 117 | 18 | 2 |
| 2012 | 107 | 12 | 1 |
| 2011 | 115 | 14 | 2 |
| 2010 | 109 | 4 | 3 |
| 2009 | 122 | 13 | 4 |
| 2008 | 122 | 35 | 1 |
| 2007 | 113 | 27 | 1 |
| 2006 | 98 | 1 | 1 |
| 2005 | 123 | 46 | 2 |
| 2004 | 115 | 30 | 1 |
| 2003 | 107 | ||
| 2002 | 7 | ||
| 2001 | 118 | 58 | 2 |
| 2000 | 34 | ||
| 1999 | 13 | ||
| 1998 | 26 | ||
| 1996 | 9 | ||
| 1995 | 9 | ||
| 1994 | 5 | ||
| 1993 | 9 |