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Loading...
| year | production | consumption |
| 1980 | 1.97 | 1.97 |
| 1981 | 2.62 | 2.62 |
| 1982 | 3.41 | 3.41 |
| 1983 | 3.89 | 3.89 |
| 1984 | 4.31 | 4.31 |
| 1985 | 4.70 | 4.70 |
| 1986 | 4.35 | 4.35 |
| 1987 | 4.31 | 4.31 |
| 1988 | 4.60 | 4.60 |
| 1989 | 5.05 | 5.05 |
| 1990 | 5.19 | 5.19 |
| 1991 | 5.47 | 5.47 |
| 1992 | 5.42 | 5.42 |
| 1993 | 5.38 | 5.38 |
| 1994 | 6.00 | 6.00 |
| 1995 | 5.83 | 5.83 |
| 1996 | 6.21 | 6.21 |
| 1997 | 6.88 | 6.88 |
| 1998 | 8.47 | 8.47 |
| 1999 | 10.06 | 10.06 |
| 2000 | 11.05 | 11.05 |
| 2001 | 9.92 | 9.92 |
| 2002 | 9.73 | 9.73 |
| 2003 | 9.33 | 9.33 |
| 2004 | 9.77 | 9.77 |
| 2005 | 9.41 | 9.41 |
| 2006 | 9.94 | 9.94 |
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