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Loading...
| year | production | consumption |
| 1980 | .37 | .37 |
| 1981 | .38 | .38 |
| 1982 | .49 | .49 |
| 1983 | .41 | .41 |
| 1984 | .42 | .42 |
| 1985 | .43 | .43 |
| 1986 | .44 | .44 |
| 1987 | .45 | .45 |
| 1988 | .69 | .69 |
| 1989 | .77 | .77 |
| 1990 | .57 | .57 |
| 1991 | .64 | .64 |
| 1992 | .64 | .64 |
| 1993 | .64 | .64 |
| 1994 | .64 | .64 |
| 1995 | .66 | .66 |
| 1996 | .95 | .95 |
| 1997 | .96 | .96 |
| 1998 | 1.05 | 1.05 |
| 1999 | 1.03 | 1.03 |
| 2000 | 1.07 | 1.07 |
| 2001 | 1.50 | 1.50 |
| 2002 | 1.83 | 1.83 |
| 2003 | 2.06 | 2.06 |
| 2004 | 2.40 | 2.40 |
| 2005 | 2.63 | 2.63 |
| 2006 | 3.57 | 3.57 |
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