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Loading...
| year | production | consumption |
| 1980 | .16 | .16 |
| 1981 | .41 | .41 |
| 1982 | .37 | .37 |
| 1983 | .38 | .38 |
| 1984 | .35 | .35 |
| 1985 | .35 | .35 |
| 1986 | .44 | .44 |
| 1987 | .49 | .49 |
| 1988 | .49 | .49 |
| 1989 | .50 | .50 |
| 1990 | .53 | .53 |
| 1991 | .53 | .53 |
| 1992 | .58 | .58 |
| 1993 | .55 | .55 |
| 1994 | .96 | .96 |
| 1995 | 1.01 | 1.01 |
| 1996 | 1.12 | 1.12 |
| 1997 | 1.08 | 1.08 |
| 1998 | 1.13 | 1.13 |
| 1999 | 1.45 | 1.45 |
| 2000 | 1.53 | 1.53 |
| 2001 | 1.44 | 1.44 |
| 2002 | 1.47 | 1.47 |
| 2003 | 1.83 | 1.83 |
| 2004 | 1.91 | 1.91 |
| 2005 | 2.02 | 2.02 |
| 2006 | 2.25 | 2.25 |
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