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| Occupation | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 |
| Security | 2,828 | 2,020 | 2,020 | 2,020 | 1,620 | 1,620 | 1,200 | 1,200 | 800 | 450 | 240 | 240 |
| Household assistants | 1,800 | 1,200 | 1,200 | 1,200 | 800 | 800 | 800 | 500 | 500 | 300 | 300 | 140 |
| All other catergories of worker | 1,800 | 1,200 | 1,200 | 1,200 | 800 | 800 | 800 | 500 | 500 | 300 | 300 | 160 |
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