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| year | production | consumption |
| 1980 | 51.00 | 45.00 |
| 1981 | 48.00 | 45.00 |
| 1982 | 47.00 | 45.00 |
| 1983 | 49.00 | 46.00 |
| 1984 | 51.00 | 48.00 |
| 1985 | 53.00 | 50.00 |
| 1986 | 55.00 | 51.00 |
| 1987 | 59.00 | 54.00 |
| 1988 | 61.00 | 56.00 |
| 1989 | 64.00 | 58.00 |
| 1990 | 66.00 | 59.00 |
| 1991 | 67.00 | 62.00 |
| 1992 | 67.00 | 64.00 |
| 1993 | 66.00 | 65.00 |
| 1994 | 67.00 | 68.00 |
| 1995 | 69.00 | 70.00 |
| 1996 | 71.00 | 71.00 |
| 1997 | 73.00 | 73.00 |
| 1998 | 77.00 | 75.00 |
| 1999 | 79.00 | 75.00 |
| 2000 | 78.00 | 79.00 |
| 2001 | 74.00 | 79.00 |
| 2002 | 76.00 | 80.00 |
| 2003 | 79.00 | 81.00 |
| 2004 | 79.00 | 83.00 |
| 2005 | 81.00 | 83.00 |
| 2006 | 79.00 | 85.00 |
| 2007 | 82.00 | 85.00 |
| 2008 | 78.00 | 84.00 |
| 2009 | 84.00 | 78.00 |
| 2010 | 87.00 | 84.00 |
| 2011 | 83.00 | 82.00 |
| 2012 | 76.00 | 82.00 |
| 2013 | 76.00 | 82.00 |
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