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| year | production | consumption |
| 1980 | 2.23 | 2.23 |
| 1981 | 2.50 | 2.50 |
| 1982 | 2.89 | 2.89 |
| 1983 | 3.62 | 3.62 |
| 1984 | 3.89 | 3.89 |
| 1985 | 3.65 | 3.65 |
| 1986 | 3.88 | 3.88 |
| 1987 | 4.47 | 4.47 |
| 1988 | 4.35 | 4.35 |
| 1989 | 4.02 | 4.02 |
| 1990 | 4.52 | 4.52 |
| 1991 | 4.83 | 4.83 |
| 1992 | 5.50 | 5.50 |
| 1993 | 5.62 | 5.62 |
| 1994 | 6.01 | 6.01 |
| 1995 | 6.13 | 6.13 |
| 1996 | 7.17 | 7.17 |
| 1997 | 8.00 | 8.00 |
| 1998 | 8.26 | 8.26 |
| 1999 | 9.22 | 9.22 |
| 2000 | 9.83 | 9.83 |
| 2001 | 11.11 | 11.11 |
| 2002 | 12.45 | 12.45 |
| 2003 | 14.01 | 14.01 |
| 2004 | 14.81 | 14.81 |
| 2005 | 16.58 | 16.58 |
| 2006 | 17.09 | 17.09 |
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