|
| year | production | consumption |
| 1980 | 19,403.00 | 19,877.00 |
| 1981 | 19,181.00 | 19,404.00 |
| 1982 | 17,820.00 | 18,001.00 |
| 1983 | 16,094.00 | 16,835.00 |
| 1984 | 17,466.00 | 17,951.00 |
| 1985 | 16,454.00 | 17,281.00 |
| 1986 | 16,059.00 | 16,221.00 |
| 1987 | 16,621.00 | 17,210.81 |
| 1988 | 17,103.00 | 18,030.00 |
| 1989 | 17,311.00 | 19,119.00 |
| 1990 | 17,810.00 | 19,174.00 |
| 1991 | 17,697.80 | 19,562.00 |
| 1992 | 17,840.00 | 20,228.00 |
| 1993 | 18,095.00 | 20,789.51 |
| 1994 | 18,821.00 | 21,247.00 |
| 1995 | 18,599.00 | 22,207.00 |
| 1996 | 18,854.00 | 22,609.00 |
| 1997 | 18,902.00 | 22,737.00 |
| 1998 | 19,024.00 | 22,246.00 |
| 1999 | 18,832.23 | 22,405.00 |
| 2000 | 19,182.00 | 23,333.00 |
| 2001 | 19,616.00 | 22,239.00 |
| 2002 | 18,928.00 | 23,007.00 |
| 2003 | 19,099.00 | 22,277.00 |
| 2004 | 18,591.00 | 22,403.00 |
| 2005 | 18,051.00 | 22,014.00 |
| 2006 | 18,504.00 | 21,699.00 |
| 2007 | 19,266.00 | 23,104.00 |
| 2008 | 20,159.00 | 23,277.00 |
| 2009 | 20,624.00 | 22,910.00 |
| 2010 | 21,316.00 | 24,087.00 |
| 2011 | 22,902.00 | 24,385.00 |
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