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Loading...
| year | production | consumption |
| 1980 | .13 | .13 |
| 1981 | .18 | .18 |
| 1982 | .24 | .24 |
| 1983 | .40 | .40 |
| 1984 | .37 | .37 |
| 1985 | .48 | .48 |
| 1986 | .52 | .52 |
| 1987 | .53 | .53 |
| 1988 | .48 | .48 |
| 1989 | .49 | .49 |
| 1990 | .51 | .51 |
| 1991 | .48 | .48 |
| 1992 | .46 | .46 |
| 1993 | .47 | .47 |
| 1994 | .46 | .46 |
| 1995 | .58 | .58 |
| 1996 | .58 | .58 |
| 1997 | .56 | .56 |
| 1998 | .58 | .58 |
| 1999 | .57 | .57 |
| 2000 | .62 | .62 |
| 2001 | .67 | .67 |
| 2002 | .57 | .57 |
| 2003 | .95 | .95 |
| 2004 | 1.18 | 1.18 |
| 2005 | 1.15 | 1.15 |
| 2006 | 1.16 | 1.16 |
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