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Loading...
| year | production | consumption |
| 1980 | .31 | .31 |
| 1981 | .32 | .32 |
| 1982 | .51 | .51 |
| 1983 | .53 | .53 |
| 1984 | .76 | .76 |
| 1985 | .88 | .88 |
| 1986 | .92 | .92 |
| 1987 | .86 | .86 |
| 1988 | 1.00 | 1.00 |
| 1989 | 1.05 | 1.05 |
| 1990 | 1.11 | 1.11 |
| 1991 | 1.19 | 1.19 |
| 1992 | 1.30 | 1.30 |
| 1993 | 1.33 | 1.33 |
| 1994 | 1.19 | 1.19 |
| 1995 | 1.81 | 1.81 |
| 1996 | 1.72 | 1.72 |
| 1997 | 1.76 | 1.76 |
| 1998 | 1.86 | 1.86 |
| 1999 | 1.89 | 1.89 |
| 2000 | 1.75 | 1.75 |
| 2001 | 1.98 | 1.98 |
| 2002 | 1.98 | 1.98 |
| 2003 | 2.28 | 2.28 |
| 2004 | 3.11 | 3.11 |
| 2005 | 3.73 | 3.73 |
| 2006 | 4.90 | 4.90 |
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