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Loading...
| year | production | consumption |
| 1980 | 3.79 | 3.79 |
| 1981 | 3.33 | 3.33 |
| 1982 | 3.37 | 3.37 |
| 1983 | 3.23 | 3.23 |
| 1984 | 3.30 | 3.30 |
| 1985 | 3.05 | 3.05 |
| 1986 | 3.52 | 3.52 |
| 1987 | 3.72 | 3.72 |
| 1988 | 3.79 | 3.79 |
| 1989 | 3.16 | 3.16 |
| 1990 | 3.25 | 3.25 |
| 1991 | 3.21 | 3.21 |
| 1992 | 3.77 | 3.77 |
| 1993 | 4.03 | 4.03 |
| 1994 | 3.82 | 3.82 |
| 1995 | 4.01 | 4.01 |
| 1996 | 4.52 | 4.52 |
| 1997 | 5.27 | 5.27 |
| 1998 | 6.10 | 6.10 |
| 1999 | 6.94 | 6.94 |
| 2000 | 7.58 | 7.58 |
| 2001 | 8.66 | 8.66 |
| 2002 | 9.85 | 9.85 |
| 2003 | 11.59 | 11.59 |
| 2004 | 13.20 | 13.20 |
| 2005 | 14.22 | 14.22 |
| 2006 | 15.49 | 15.49 |
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