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| year | production | consumption |
| 1980 | 63.00 | 60.00 |
| 1981 | 62.00 | 59.00 |
| 1982 | 58.00 | 58.00 |
| 1983 | 57.00 | 59.00 |
| 1984 | 60.00 | 61.00 |
| 1985 | 60.00 | 62.00 |
| 1986 | 64.00 | 63.00 |
| 1987 | 65.00 | 66.00 |
| 1988 | 66.00 | 69.00 |
| 1989 | 70.00 | 72.00 |
| 1990 | 68.00 | 73.00 |
| 1991 | 70.00 | 76.00 |
| 1992 | 73.00 | 78.00 |
| 1993 | 72.00 | 80.00 |
| 1994 | 75.00 | 82.00 |
| 1995 | 76.00 | 84.00 |
| 1996 | 80.00 | 87.00 |
| 1997 | 80.00 | 89.00 |
| 1998 | 85.00 | 93.00 |
| 1999 | 81.00 | 95.00 |
| 2000 | 84.00 | 99.00 |
| 2001 | 88.00 | 101.00 |
| 2002 | 90.00 | 102.00 |
| 2003 | 91.00 | 104.00 |
| 2004 | 97.00 | 108.00 |
| 2005 | 95.00 | 108.00 |
| 2006 | 93.00 | 110.00 |
| 2007 | 99.00 | 112.00 |
| 2008 | 100.00 | 111.00 |
| 2009 | 106.00 | 106.00 |
| 2010 | 110.00 | 108.00 |
| 2011 | 105.00 | 110.00 |
| 2012 | 95.00 | 108.00 |
| 2013 | 93.00 | 107.00 |
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