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| year | production | consumption |
| 1980 | .87 | .87 |
| 1981 | .91 | .91 |
| 1982 | 1.28 | 1.28 |
| 1983 | 1.35 | 1.35 |
| 1984 | 1.42 | 1.42 |
| 1985 | 1.64 | 1.64 |
| 1986 | 3.40 | 3.40 |
| 1987 | 4.33 | 4.33 |
| 1988 | 4.66 | 4.66 |
| 1989 | 4.68 | 4.68 |
| 1990 | 4.87 | 4.87 |
| 1991 | 5.17 | 5.17 |
| 1992 | 5.52 | 5.52 |
| 1993 | 5.59 | 5.59 |
| 1994 | 5.33 | 5.33 |
| 1995 | 5.40 | 5.40 |
| 1996 | 5.45 | 5.45 |
| 1997 | 5.20 | 5.20 |
| 1998 | 5.67 | 5.67 |
| 1999 | 5.84 | 5.84 |
| 2000 | 6.05 | 6.05 |
| 2001 | 5.79 | 5.79 |
| 2002 | 5.60 | 5.60 |
| 2003 | 8.32 | 8.32 |
| 2004 | 8.66 | 8.66 |
| 2005 | 9.88 | 9.88 |
| 2006 | 8.75 | 8.75 |
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