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Loading...
| year | production | consumption |
| 1980 | .88 | .88 |
| 1981 | .90 | .90 |
| 1982 | .96 | .96 |
| 1983 | 1.00 | 1.00 |
| 1984 | 1.03 | 1.03 |
| 1985 | 1.04 | 1.04 |
| 1986 | 1.09 | 1.09 |
| 1987 | 1.11 | 1.11 |
| 1988 | 1.21 | 1.21 |
| 1989 | 1.18 | 1.18 |
| 1990 | 1.10 | 1.10 |
| 1991 | .96 | .96 |
| 1992 | 1.02 | 1.02 |
| 1993 | .68 | .68 |
| 1994 | .68 | .68 |
| 1995 | .52 | .52 |
| 1996 | .70 | .70 |
| 1997 | .72 | .72 |
| 1998 | .73 | .73 |
| 1999 | .68 | .68 |
| 2000 | .70 | .70 |
| 2001 | .73 | .73 |
| 2002 | .75 | .75 |
| 2003 | .76 | .76 |
| 2004 | .61 | .61 |
| 2005 | .56 | .56 |
| 2006 | .43 | .43 |
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