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Loading...
| year | production | consumption |
| 1980 | .35 | .35 |
| 1981 | .57 | .57 |
| 1982 | .58 | .58 |
| 1983 | .63 | .63 |
| 1984 | .53 | .53 |
| 1985 | .43 | .43 |
| 1986 | .38 | .38 |
| 1987 | .43 | .43 |
| 1988 | .43 | .43 |
| 1989 | .44 | .44 |
| 1990 | .42 | .42 |
| 1991 | .42 | .42 |
| 1992 | .40 | .40 |
| 1993 | .38 | .38 |
| 1994 | .39 | .39 |
| 1995 | .43 | .43 |
| 1996 | .43 | .43 |
| 1997 | .48 | .48 |
| 1998 | .45 | .45 |
| 1999 | .59 | .59 |
| 2000 | .77 | .77 |
| 2001 | .94 | .94 |
| 2002 | .96 | .96 |
| 2003 | .99 | .99 |
| 2004 | .98 | .98 |
| 2005 | 1.02 | 1.02 |
| 2006 | 1.10 | 1.10 |
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