| Year | 1970 | 1975 | 1980 | 1985 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Specification![]() |
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Total![]() |
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| 1 - 4 wage-earners |
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| 5 - 9 wage-earners |
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| 10 - 19 wage-earners |
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| 20 - 49 wage-earners |
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50 - 99 wage-earners 2![]() |
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| 100 - 199 wage-earners |
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| 200 - 499 wage-earners |
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| more than 499 wage-earners |
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