| Year | Production | Imports | Exports | Losses | Closing stock | Domestic use | Domestic consumption | |
|---|---|---|---|---|---|---|---|---|
| total | per capita | |||||||
| tousand tonnes | kg | |||||||
| 1970 | 42.5 | 0.8 | 8.9 | 5.9 | – | 28.5 | 26.8 | 2.6 |
| 1975 | 55.1 | 0.0 | 9.3 | 8.5 | – | 37.3 | 34.0 | 3.3 |
| 1980 | 48.8 | 0.6 | 6.2 | 7.6 | – | 35.6 | 32.0 | 3.0 |
| 1981 | 49.0 | 2.1 | 6.1 | 7.4 | – | 37.6 | 34.0 | 3.2 |
| 1982 | 51.1 | 2.3 | 7.2 | 7.5 | – | 38.7 | 35.3 | 3.3 |
| 1983 | 54.9 | 2.0 | 7.3 | 7.9 | – | 41.7 | 37.9 | 3.6 |
| 1984 | 58.0 | 0.9 | 9.8 | 7.8 | – | 41.3 | 37.8 | 3.6 |
| 1985 | 54.8 | 0.7 | 8.0 | 7.0 | – | 40.5 | 39.0 | 3.7 |
| 1986 | 50.9 | 1.1 | 6.3 | 6.0 | – | 39.7 | 38.9 | 3.7 |
| 1987 | 52.5 | 0.2 | 6.4 | 5.4 | – | 40.9 | 40.1 | 3.8 |
| 1988 | 51.9 | 0.1 | 7.2 | 5.0 | – | 39.8 | 39.2 | 3.7 |
| 1989 | 51.7 | 0.4 | 6.5 | 4.7 | – | 40.9 | 40.6 | 3.9 |
| 1990 | 49.6 | 1.5 | 4.8 | 4.6 | – | 41.7 | 41.5 | 4.0 |
| 1991 | 46.8 | .. | .. | 5.4 | – | 47.5 | 46.9 | 4.5 |
| 1992 | 39.2 | 23.5 | 3.4 | 5.0 | – | 54.3 | 53.0 | 5.1 |
| 1993 | 33.0 | 17.0 | 3.3 | 1.0 | – | 45.7 | 45.0 | 4.4 |
| 1994 | 28.5 | 17.8 | 3.8 | 0.5 | – | 42.0 | 42.0 | 4.1 |
| 1995 | 26.6 | 12.0 | 3.6 | 0.0 | – | 35.0 | 35.0 | 3.4 |
| 1996 | 31.1 | 5.1 | 6.0 | 0.2 | – | 30.0 | 30.0 | 3.0 |
| 1997 | 27.3 | 5.1 | 5.0 | 0.1 | – | 27.3 | 27.3 | 2.7 |
| 1998 | 26.3 | 5.9 | 3.3 | 0.1 | – | 28.8 | 28.8 | 2.8 |
| 1999 | 29.4 | 4.0 | 0.5 | 0.1 | – | 32.8 | 32.8 | 3.2 |
| 2000 | 29.7 | 8.4 | 6.7 | 1.2 | 1.2 | 31.4 | 31.4 | 3.1 |
| 2001 | 25.7 | 14.6 | 8.1 | 1.6 | 1.2 | 31.8 | 31.8 | 3.1 |
| 2002 | 27.3 | 15.9 | 9.4 | 1.4 | 0.0 | 33.6 | 33.6 | 3.3 |
| 2003 | 27.5 | 10.3 | 9.8 | 0.2 | 0.0 | 27.8 | 27.8 | 2.7 |
| 2004 | 25.8 | 13.4 | 12.5 | 0.8 | 0.0 | 25.9 | 25.9 | 2.6 |
| 2004 | 36.1 | 13.4 | 12.5 | 2.0 | 1.0a | 35.5 | 30.4 | 3.0 |
| 2005 | 33.3 | 16.4 | 15.9 | 1.8 | 1.3 | 31.7 | 26.7 | 2.7 |
| 2006 | 35.8 | 16.0 | 16.2 | 1.9 | 1.3 | 33.7 | 28.3 | 2.8 |
| 2007 | 36.5 | 13.7 | 17.8 | 1.5 | 1.3 | 30.9 | 25.5 | 2.5 |
| 2008 | 36.2 | 14.0 | 17.1 | 1.5 | 1.3 | 31.6 | 28.0 | 2.8 |
| 2009 | 32.8 | 12.6 | 13.7 | 1.4 | 1.2 | 30.3 | 27.0 | 2.7 |
| 2010 | 32.4 | 16.1 | 17.1 | 1.5 | 1.0 | 30.1 | 26.7 | 2.7 |
| 2011 | 31.2 | 16.3 | 22.7 | 1.4 | 0.7 | 23.7 | 21.5 | 2.2 |
| 2012 | 28.4 | 16.5 | 20.8 | 1.3 | 0.6 | 22.9 | 21.0 | 2.1 |
| 2013 | 26.5 | 20.0 | 22.2 | 1.2 | 0.5 | 23.2 | 21.8 | 2.2 |
| 2014 | 29.5 | 15.3 | 21.1 | 1.3 | 0.4 | 22.5 | 21.0 | 2.1 |
| 2015 | 32.6 | 14.0 | 20.5 | 1.4 | 0.4 | 24.7 | 23.1 | 2.3 |
| 2016 | 32.9 | 12.1 | 23.0 | 1.3 | 0.2 | 20.9 | 19.5 | 2.0 |
| 2017 | 33.7 | 14.8 | 25.6 | 1.2 | 0.1 | 21.8 | 20.2 | 2.1 |
| 2018 | 33.7 | 11.8 | 23.6 | 1.2 | 0.0 | 20.7 | 19.0 | 1.9 |
| 2019 | 33.6 | 15.5 | 26.4 | 1.3 | 0.0 | 21.4 | 19.7 | 2.0 |