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| Group of worker | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 |
| Manual workers except those engaged in agriculture, agro-indus. or export oriented industries | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | n.a. |
| Manual workers engaged in agric., agro-indus. or export oriented ind. | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | n.a. |
| Shop assistants employed in establishments where liquor is sold and consumed | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | 1.50 |
| Shop assistants employed in shops where liquor is not sold and consumed | 1.75 | 1.75 | 1.75 | 1.75 | 1.75 | 1.75 | 1.25 |
| Domestic workers employed in private homes | 1.75 | 1.75 | 1.75 | 1.75 | 1.75 | 1.75 | 1.10 |
| Domestic workers employed in institutions such as boarding hous. guest houses, hotels, hospitals, infirmaries, and other sim. instit. | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | 2.25 | 1.10 |
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