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| year | production | consumption |
| 1986 | 45.00 | 32.00 |
| 1987 | 49.00 | 42.00 |
| 1988 | 50.00 | 46.00 |
| 1989 | 52.00 | 47.00 |
| 1990 | 54.00 | 47.00 |
| 1991 | 56.00 | 53.00 |
| 1992 | 53.00 | 55.00 |
| 1993 | 54.00 | 61.00 |
| 1994 | 60.00 | 63.00 |
| 1995 | 69.00 | 62.00 |
| 1996 | 68.00 | 62.00 |
| 1997 | 65.00 | 40.00 |
| 1998 | 67.00 | 26.00 |
| 1999 | 73.00 | 24.00 |
| 2000 | 100.00 | 54.00 |
| 2001 | 110.00 | 59.00 |
| 2002 | 98.00 | 46.00 |
| 2003 | 104.00 | 59.00 |
| 2004 | 97.00 | 43.00 |
| 2005 | 87.00 | 48.00 |
| 2006 | 91.00 | 79.00 |
| 2007 | 87.00 | 88.00 |
| 2008 | 86.00 | 101.00 |
| 2009 | 89.00 | 99.00 |
| 2010 | 97.00 | 114.00 |
| 2011 | 100.00 | 117.00 |
| 2012 | 87.00 | 96.00 |
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