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| year | production | consumption |
| 1986 | 4.40 | 20.00 |
| 1987 | 5.00 | 22.00 |
| 1988 | 5.50 | 24.00 |
| 1989 | 6.30 | 28.00 |
| 1990 | 7.10 | 32.00 |
| 1991 | 6.90 | 33.00 |
| 1992 | 9.80 | 35.00 |
| 1993 | 13.00 | 38.00 |
| 1994 | 40.00 | 42.00 |
| 1995 | 23.00 | 47.00 |
| 1996 | 30.00 | 57.00 |
| 1997 | 74.00 | 57.00 |
| 1998 | 72.00 | 57.00 |
| 1999 | 80.00 | 59.00 |
| 2000 | 42.00 | 73.00 |
| 2001 | 101.00 | 78.00 |
| 2002 | 46.00 | 80.00 |
| 2003 | 108.00 | 70.00 |
| 2004 | 115.00 | 84.00 |
| 2005 | 111.00 | 22.00 |
| 2006 | 51.00 | 138.00 |
| 2007 | 49.00 | 120.00 |
| 2008 | 62.00 | 140.00 |
| 2009 | 159.00 | 112.00 |
| 2010 | 57.00 | 192.00 |
| 2011 | 65.00 | 220.00 |
| 2012 | 64.00 | 236.00 |
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