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| year | production | consumption |
| 1980 | 22.43 | 1.66 |
| 1981 | 22.44 | 2.03 |
| 1982 | 15.10 | 1.97 |
| 1983 | 11.92 | 2.12 |
| 1984 | 11.29 | 2.47 |
| 1985 | 8.64 | 2.71 |
| 1986 | 12.04 | 3.02 |
| 1987 | 10.84 | 3.07 |
| 1988 | 12.86 | 3.18 |
| 1989 | 12.81 | 3.13 |
| 1990 | 15.92 | 3.35 |
| 1991 | 19.75 | 3.50 |
| 1992 | 20.39 | 3.66 |
| 1993 | 20.11 | 3.78 |
| 1994 | 20.39 | 3.90 |
| 1995 | 20.66 | 3.83 |
| 1996 | 20.82 | 4.10 |
| 1997 | 21.24 | 4.37 |
| 1998 | 21.42 | 4.54 |
| 1999 | 20.18 | 4.60 |
| 2000 | 21.59 | 4.85 |
| 2001 | 20.95 | 5.14 |
| 2002 | 20.27 | 5.38 |
| 2003 | 23.05 | 5.76 |
| 2004 | 24.63 | 6.21 |
| 2005 | 26.06 | 6.53 |
| 2006 | 25.29 | 6.85 |
| 2007 | 24.51 | 6.90 |
| 2008 | 26.18 | 7.41 |
| 2009 | 23.71 | 7.67 |
| 2010 | 25.35 | 8.32 |
| 2011 | 26.72 | 8.86 |
| 2012 | 27.94 | 9.66 |
| 2013 | 27.60 | 9.65 |
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