|
| year | production | consumption |
| 1980 | 1,936.00 | 1,270.00 |
| 1981 | 2,313.00 | 1,399.00 |
| 1982 | 2,748.00 | 1,476.00 |
| 1983 | 2,689.00 | 1,350.00 |
| 1984 | 2,780.00 | 1,395.00 |
| 1985 | 2,745.00 | 1,476.00 |
| 1986 | 2,435.00 | 1,523.00 |
| 1987 | 2,548.00 | 1,576.00 |
| 1988 | 2,512.00 | 1,598.00 |
| 1989 | 2,519.76 | 1,715.00 |
| 1990 | 2,553.03 | 1,599.00 |
| 1991 | 2,679.80 | 1,743.00 |
| 1992 | 2,669.22 | 1,769.00 |
| 1993 | 2,673.00 | 1,821.00 |
| 1994 | 2,781.90 | 1,923.00 |
| 1995 | 2,711.39 | 1,801.00 |
| 1996 | 2,944.07 | 1,820.00 |
| 1997 | 3,104.10 | 1,888.00 |
| 1998 | 3,159.56 | 2,002.00 |
| 1999 | 2,998.27 | 2,043.00 |
| 2000 | 3,104.07 | 2,095.93 |
| 2001 | 3,217.98 | 2,068.70 |
| 2002 | 3,262.90 | 2,019.14 |
| 2003 | 3,458.68 | 2,015.66 |
| 2004 | 3,475.83 | 2,069.21 |
| 2005 | 3,423.12 | 2,116.67 |
| 2006 | 3,345.43 | 2,122.93 |
| 2007 | 3,142.95 | 2,172.81 |
| 2008 | 2,838.99 | 2,161.14 |
| 2009 | 2,645.84 | 2,070.72 |
| 2010 | 2,621.14 | 2,080.43 |
| 2011 | 2,599.85 | 2,132.72 |
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