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| year | production | consumption |
| 1980 | 2.93 | 1.34 |
| 1981 | 3.02 | 1.38 |
| 1982 | 3.02 | 1.38 |
| 1983 | 3.44 | 1.47 |
| 1984 | 3.67 | 1.52 |
| 1985 | 3.77 | 1.53 |
| 1986 | 3.91 | 1.53 |
| 1987 | 4.34 | 1.56 |
| 1988 | 4.69 | 1.59 |
| 1989 | 5.59 | 1.65 |
| 1990 | 5.80 | 1.70 |
| 1991 | 6.18 | 1.61 |
| 1992 | 6.86 | 1.70 |
| 1993 | 7.12 | 1.70 |
| 1994 | 7.77 | 1.67 |
| 1995 | 8.35 | 1.78 |
| 1996 | 9.26 | 1.67 |
| 1997 | 9.58 | 1.74 |
| 1998 | 9.33 | 1.79 |
| 1999 | 9.53 | 1.87 |
| 2000 | 10.30 | 1.97 |
| 2001 | 10.30 | 1.89 |
| 2002 | 10.69 | 1.93 |
| 2003 | 10.63 | 1.80 |
| 2004 | 10.79 | 1.88 |
| 2005 | 10.66 | 1.97 |
| 2006 | 10.12 | 1.78 |
| 2007 | 9.92 | 1.93 |
| 2008 | 10.13 | 1.93 |
| 2009 | 9.88 | 1.90 |
| 2010 | 9.45 | 1.83 |
| 2011 | 9.05 | 1.80 |
| 2012 | 9.46 | 1.91 |
| 2013 | 8.97 | 1.83 |
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