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Loading...
| year | production | consumption |
| 1980 | .09 | .09 |
| 1981 | .08 | .08 |
| 1982 | .10 | .10 |
| 1983 | .14 | .14 |
| 1984 | .09 | .09 |
| 1985 | .11 | .11 |
| 1986 | .10 | .10 |
| 1987 | .10 | .10 |
| 1988 | .12 | .12 |
| 1989 | .11 | .11 |
| 1990 | .10 | .10 |
| 1991 | .10 | .10 |
| 1992 | .10 | .10 |
| 1993 | .10 | .10 |
| 1994 | .11 | .11 |
| 1995 | .11 | .11 |
| 1996 | .35 | .35 |
| 1997 | .44 | .44 |
| 1998 | .48 | .48 |
| 1999 | .55 | .55 |
| 2000 | .67 | .67 |
| 2001 | .65 | .65 |
| 2002 | .91 | .91 |
| 2003 | 1.07 | 1.07 |
| 2004 | 1.20 | 1.20 |
| 2005 | 1.31 | 1.31 |
| 2006 | 1.39 | 1.39 |
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