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| year | production | consumption |
| 1980 | 3.94 | 1.61 |
| 1981 | 3.29 | 1.51 |
| 1982 | 5.14 | 1.73 |
| 1983 | 5.68 | 2.12 |
| 1984 | 5.31 | 2.23 |
| 1985 | 5.59 | 2.40 |
| 1986 | 5.06 | 2.43 |
| 1987 | 5.67 | 2.54 |
| 1988 | 5.71 | 2.70 |
| 1989 | 7.02 | 2.97 |
| 1990 | 7.67 | 3.10 |
| 1991 | 8.27 | 3.24 |
| 1992 | 8.53 | 3.35 |
| 1993 | 8.83 | 3.48 |
| 1994 | 9.16 | 3.68 |
| 1995 | 9.35 | 3.82 |
| 1996 | 9.65 | 3.96 |
| 1997 | 9.84 | 4.43 |
| 1998 | 9.90 | 4.58 |
| 1999 | 10.00 | 4.83 |
| 2000 | 10.40 | 5.01 |
| 2001 | 10.67 | 5.39 |
| 2002 | 10.44 | 5.89 |
| 2003 | 11.36 | 6.18 |
| 2004 | 12.06 | 6.39 |
| 2005 | 13.12 | 7.44 |
| 2006 | 13.12 | 7.92 |
| 2007 | 13.00 | 8.13 |
| 2008 | 13.36 | 8.50 |
| 2009 | 14.26 | 9.33 |
| 2010 | 14.61 | 9.19 |
| 2011 | 14.79 | 9.47 |
| 2012 | 13.63 | 9.84 |
| 2013 | 13.03 | 9.87 |
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