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| year | production | consumption |
| 1980 | 52.00 | 55.00 |
| 1981 | 43.00 | 48.00 |
| 1982 | 42.00 | 50.00 |
| 1983 | 42.00 | 52.00 |
| 1984 | 42.00 | 48.00 |
| 1985 | 45.00 | 52.00 |
| 1986 | 51.00 | 56.00 |
| 1987 | 52.00 | 58.00 |
| 1988 | 50.00 | 62.00 |
| 1989 | 52.00 | 65.00 |
| 1990 | 57.00 | 68.00 |
| 1991 | 66.00 | 79.00 |
| 1992 | 66.00 | 79.00 |
| 1993 | 73.00 | 86.00 |
| 1994 | 74.00 | 87.00 |
| 1995 | 70.00 | 93.00 |
| 1996 | 73.00 | 113.00 |
| 1997 | 80.00 | 108.00 |
| 1998 | 80.00 | 119.00 |
| 1999 | 75.00 | 118.00 |
| 2000 | 76.00 | 122.00 |
| 2001 | 81.00 | 133.00 |
| 2002 | 84.00 | 142.00 |
| 2003 | 80.00 | 155.00 |
| 2004 | 75.00 | 158.00 |
| 2005 | 81.00 | 167.00 |
| 2006 | 78.00 | 160.00 |
| 2007 | 76.00 | 159.00 |
| 2008 | 87.00 | 158.00 |
| 2009 | 85.00 | 152.00 |
| 2010 | 78.00 | 157.00 |
| 2011 | 87.00 | 150.00 |
| 2012 | 81.00 | 148.00 |
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