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Loading...
| year | production | consumption |
| 1980 | .05 | .05 |
| 1981 | .13 | .13 |
| 1982 | .17 | .17 |
| 1983 | .18 | .18 |
| 1984 | .18 | .18 |
| 1985 | .18 | .18 |
| 1986 | .21 | .21 |
| 1987 | .23 | .23 |
| 1988 | .25 | .25 |
| 1989 | .26 | .26 |
| 1990 | .29 | .29 |
| 1991 | .27 | .27 |
| 1992 | .22 | .22 |
| 1993 | .24 | .24 |
| 1994 | .25 | .25 |
| 1995 | .28 | .28 |
| 1996 | .33 | .33 |
| 1997 | .36 | .36 |
| 1998 | .62 | .62 |
| 1999 | 1.08 | 1.08 |
| 2000 | 1.26 | 1.26 |
| 2001 | 1.38 | 1.38 |
| 2002 | 1.36 | 1.36 |
| 2003 | 1.34 | 1.34 |
| 2004 | 1.41 | 1.41 |
| 2005 | 1.58 | 1.58 |
| 2006 | 2.50 | 2.50 |
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