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| year | production | consumption |
| 1986 | 39.00 | 42.00 |
| 1987 | 39.00 | 44.00 |
| 1988 | 46.00 | 45.00 |
| 1989 | 63.00 | 66.00 |
| 1990 | 64.00 | 88.00 |
| 1991 | 66.00 | 109.00 |
| 1992 | 77.00 | 127.00 |
| 1993 | 86.00 | 143.00 |
| 1994 | 105.00 | 161.00 |
| 1995 | 110.00 | 181.00 |
| 1996 | 159.00 | 181.00 |
| 1997 | 159.00 | 167.00 |
| 1998 | 144.00 | 147.00 |
| 1999 | 145.00 | 147.00 |
| 2000 | 130.00 | 120.00 |
| 2001 | 121.00 | 90.00 |
| 2002 | 121.00 | 93.00 |
| 2003 | 116.00 | 98.00 |
| 2004 | 128.00 | 117.00 |
| 2005 | 166.00 | 184.00 |
| 2006 | 125.00 | 117.00 |
| 2007 | 153.00 | 116.00 |
| 2008 | 131.00 | 63.00 |
| 2009 | 132.00 | 60.00 |
| 2010 | 118.00 | 60.00 |
| 2011 | 115.00 | 57.00 |
| 2012 | 121.00 | 56.00 |
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