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| year | production | consumption |
| 1980 | 2.86 | 2.86 |
| 1981 | 3.21 | 3.21 |
| 1982 | 3.80 | 3.80 |
| 1983 | 4.54 | 4.54 |
| 1984 | 4.96 | 4.96 |
| 1985 | 4.53 | 4.53 |
| 1986 | 4.99 | 4.99 |
| 1987 | 5.44 | 5.44 |
| 1988 | 5.59 | 5.59 |
| 1989 | 5.24 | 5.24 |
| 1990 | 5.34 | 5.34 |
| 1991 | 5.69 | 5.69 |
| 1992 | 6.63 | 6.63 |
| 1993 | 6.75 | 6.75 |
| 1994 | 7.22 | 7.22 |
| 1995 | 7.57 | 7.57 |
| 1996 | 9.16 | 9.16 |
| 1997 | 10.01 | 10.01 |
| 1998 | 10.33 | 10.33 |
| 1999 | 11.05 | 11.05 |
| 2000 | 11.93 | 11.93 |
| 2001 | 14.06 | 14.06 |
| 2002 | 15.70 | 15.70 |
| 2003 | 17.61 | 17.61 |
| 2004 | 18.50 | 18.50 |
| 2005 | 19.66 | 19.66 |
| 2006 | 20.55 | 20.55 |
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