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| year | production | consumption |
| 1980 | 3,051.00 | 2,802.00 |
| 1981 | 2,727.00 | 2,565.00 |
| 1982 | 2,858.00 | 2,827.00 |
| 1983 | 2,880.00 | 2,772.00 |
| 1984 | 2,996.00 | 2,844.00 |
| 1985 | 3,422.00 | 3,336.00 |
| 1986 | 3,954.00 | 3,940.00 |
| 1987 | 5,361.00 | 5,333.00 |
| 1988 | 5,168.00 | 5,130.00 |
| 1989 | 5,282.00 | 5,249.00 |
| 1990 | 5,892.00 | 5,903.00 |
| 1991 | 6,641.00 | 6,614.00 |
| 1992 | 6,568.00 | 6,554.00 |
| 1993 | 5,894.00 | 5,880.00 |
| 1994 | 5,463.00 | 5,215.00 |
| 1995 | 5,173.00 | 4,954.00 |
| 1996 | 4,871.00 | 4,705.00 |
| 1997 | 4,424.00 | 4,300.00 |
| 1998 | 4,597.00 | 4,407.00 |
| 1999 | 5,099.00 | 5,198.00 |
| 2000 | 4,696.00 | 5,001.00 |
| 2001 | 4,569.00 | 4,969.00 |
| 2002 | 4,367.00 | 4,582.00 |
| 2003 | 3,913.00 | 3,864.00 |
| 2004 | 3,764.00 | 3,520.00 |
| 2005 | 3,991.00 | 4,122.00 |
| 2006 | 3,800.00 | 4,113.00 |
| 2007 | 3,661.00 | 3,818.00 |
| 2008 | 2,776.00 | 2,960.00 |
| 2009 | 2,942.00 | 3,012.00 |
| 2010 | 3,225.00 | 3,286.00 |
| 2011 | 3,526.00 | 3,589.00 |
| 2012 | 3,303.00 | 3,758.00 |
| 2013 | 3,838.00 | 3,786.00 |
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