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| year | production | consumption |
| 1980 | 1.48 | 1.48 |
| 1981 | 1.46 | 1.46 |
| 1982 | 1.50 | 1.50 |
| 1983 | 1.53 | 1.53 |
| 1984 | 1.69 | 1.69 |
| 1985 | 1.64 | 1.64 |
| 1986 | 1.68 | 1.68 |
| 1987 | 1.71 | 1.71 |
| 1988 | 1.82 | 1.82 |
| 1989 | 2.40 | 2.40 |
| 1990 | 2.49 | 2.49 |
| 1991 | 2.67 | 2.67 |
| 1992 | 2.67 | 2.67 |
| 1993 | 2.78 | 2.78 |
| 1994 | 2.64 | 2.64 |
| 1995 | 2.58 | 2.58 |
| 1996 | 2.57 | 2.57 |
| 1997 | 2.57 | 2.57 |
| 1998 | 2.82 | 2.82 |
| 1999 | 3.13 | 3.13 |
| 2000 | 3.45 | 3.45 |
| 2001 | 3.20 | 3.20 |
| 2002 | 3.41 | 3.41 |
| 2003 | 3.27 | 3.27 |
| 2004 | 3.48 | 3.48 |
| 2005 | 4.27 | 4.27 |
| 2006 | 4.48 | 4.48 |
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