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Loading...
| year | production | consumption |
| 1980 | .03 | .03 |
| 1981 | .03 | .03 |
| 1982 | .03 | .03 |
| 1983 | .10 | .10 |
| 1984 | .30 | .30 |
| 1985 | .33 | .33 |
| 1986 | .32 | .32 |
| 1987 | .26 | .26 |
| 1988 | .20 | .20 |
| 1989 | .41 | .41 |
| 1990 | .42 | .42 |
| 1991 | .49 | .49 |
| 1992 | .48 | .48 |
| 1993 | .41 | .41 |
| 1994 | .36 | .36 |
| 1995 | .34 | .34 |
| 1996 | .29 | .29 |
| 1997 | .23 | .23 |
| 1998 | .17 | .17 |
| 1999 | .15 | .15 |
| 2000 | .19 | .19 |
| 2001 | .24 | .24 |
| 2002 | .25 | .25 |
| 2003 | .36 | .36 |
| 2004 | .36 | .36 |
| 2005 | .41 | .41 |
| 2006 | .42 | .42 |
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