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| year | production | consumption |
| 1980 | 34.00 | 32.00 |
| 1981 | 37.00 | 35.00 |
| 1982 | 40.00 | 37.00 |
| 1983 | 45.00 | 42.00 |
| 1984 | 50.00 | 46.00 |
| 1985 | 53.00 | 50.00 |
| 1986 | 59.00 | 56.00 |
| 1987 | 67.00 | 64.00 |
| 1988 | 77.00 | 73.00 |
| 1989 | 86.00 | 81.00 |
| 1990 | 98.00 | 94.00 |
| 1991 | 110.00 | 107.00 |
| 1992 | 122.00 | 119.00 |
| 1993 | 134.00 | 126.00 |
| 1994 | 171.00 | 163.00 |
| 1995 | 189.00 | 180.00 |
| 1996 | 210.00 | 200.00 |
| 1997 | 229.00 | 218.00 |
| 1998 | 225.00 | 212.00 |
| 1999 | 222.00 | 212.00 |
| 2000 | 272.00 | 260.00 |
| 2001 | 291.00 | 279.00 |
| 2002 | 310.00 | 296.00 |
| 2003 | 324.00 | 313.00 |
| 2004 | 346.00 | 333.00 |
| 2005 | 364.00 | 350.00 |
| 2006 | 379.00 | 364.00 |
| 2007 | 402.00 | 387.00 |
| 2008 | 419.00 | 403.00 |
| 2009 | 426.00 | 409.00 |
| 2010 | 468.00 | 450.00 |
| 2011 | 490.00 | 472.00 |
| 2012 | 500.00 | 482.00 |
| 2013 | 506.00 | 487.00 |
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