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| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 1.79 | 1.79 |
| 1993 | 1.70 | 1.70 |
| 1994 | 1.56 | 1.56 |
| 1995 | 1.53 | 1.53 |
| 1996 | 1.51 | 1.51 |
| 1997 | 1.48 | 1.48 |
| 1998 | 1.47 | 1.47 |
| 1999 | 2.00 | 2.00 |
| 2000 | 2.47 | 2.47 |
| 2001 | 2.81 | 2.81 |
| 2002 | 2.81 | 2.81 |
| 2003 | 2.03 | 2.03 |
| 2004 | 2.11 | 2.11 |
| 2005 | 2.90 | 2.90 |
| 2006 | 3.05 | 3.05 |
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