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| year | production | consumption |
| 1980 | 1.24 | 1.24 |
| 1981 | 1.80 | 1.80 |
| 1982 | 2.03 | 2.03 |
| 1983 | 1.98 | 1.98 |
| 1984 | 2.22 | 2.22 |
| 1985 | 1.60 | 1.60 |
| 1986 | 1.78 | 1.78 |
| 1987 | 2.20 | 2.20 |
| 1988 | 2.37 | 2.37 |
| 1989 | 3.31 | 3.31 |
| 1990 | 3.70 | 3.70 |
| 1991 | 3.73 | 3.73 |
| 1992 | 4.18 | 4.18 |
| 1993 | 4.53 | 4.53 |
| 1994 | 5.43 | 5.43 |
| 1995 | 5.34 | 5.34 |
| 1996 | 5.53 | 5.53 |
| 1997 | 6.52 | 6.52 |
| 1998 | 6.93 | 6.93 |
| 1999 | 7.96 | 7.96 |
| 2000 | 7.98 | 7.98 |
| 2001 | 8.42 | 8.42 |
| 2002 | 8.91 | 8.91 |
| 2003 | 9.32 | 9.32 |
| 2004 | 9.20 | 9.20 |
| 2005 | 10.04 | 10.04 |
| 2006 | 11.03 | 11.03 |
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