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Loading...
| year | production | consumption |
| 1980 | .30 | .30 |
| 1981 | .30 | .30 |
| 1982 | .34 | .34 |
| 1983 | .39 | .39 |
| 1984 | .36 | .36 |
| 1985 | .52 | .52 |
| 1986 | .58 | .58 |
| 1987 | .58 | .58 |
| 1988 | .62 | .62 |
| 1989 | .63 | .63 |
| 1990 | .66 | .66 |
| 1991 | .77 | .77 |
| 1992 | .85 | .85 |
| 1993 | .87 | .87 |
| 1994 | .94 | .94 |
| 1995 | 1.00 | 1.00 |
| 1996 | .98 | .98 |
| 1997 | 1.07 | 1.07 |
| 1998 | 1.11 | 1.11 |
| 1999 | 1.37 | 1.37 |
| 2000 | 1.71 | 1.71 |
| 2001 | 1.86 | 1.86 |
| 2002 | 2.08 | 2.08 |
| 2003 | 2.15 | 2.15 |
| 2004 | 2.58 | 2.58 |
| 2005 | 3.64 | 3.64 |
| 2006 | 4.77 | 4.77 |
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