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Loading...
| year | production | consumption |
| 1980 | .29 | .29 |
| 1981 | .05 | .05 |
| 1982 | .06 | .06 |
| 1983 | .06 | .06 |
| 1984 | .06 | .06 |
| 1985 | .06 | .06 |
| 1986 | .06 | .06 |
| 1987 | .07 | .07 |
| 1988 | .08 | .08 |
| 1989 | .09 | .09 |
| 1990 | .33 | .33 |
| 1991 | .38 | .38 |
| 1992 | .42 | .42 |
| 1993 | .43 | .43 |
| 1994 | .45 | .45 |
| 1995 | .52 | .52 |
| 1996 | .51 | .51 |
| 1997 | .61 | .61 |
| 1998 | .64 | .64 |
| 1999 | .81 | .81 |
| 2000 | .81 | .81 |
| 2001 | .81 | .81 |
| 2002 | .81 | .81 |
| 2003 | .81 | .81 |
| 2004 | .83 | .83 |
| 2005 | .85 | .85 |
| 2006 | .95 | .95 |
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