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| year | production | consumption |
| 1980 | 1.14 | 1.14 |
| 1981 | 1.25 | 1.25 |
| 1982 | 1.67 | 1.67 |
| 1983 | 1.28 | 1.28 |
| 1984 | 1.48 | 1.48 |
| 1985 | 1.35 | 1.35 |
| 1986 | 1.42 | 1.42 |
| 1987 | 1.44 | 1.44 |
| 1988 | 1.41 | 1.41 |
| 1989 | 2.06 | 2.06 |
| 1990 | 2.12 | 2.12 |
| 1991 | 2.30 | 2.30 |
| 1992 | 2.34 | 2.34 |
| 1993 | 2.21 | 2.21 |
| 1994 | 2.40 | 2.40 |
| 1995 | 2.66 | 2.66 |
| 1996 | 2.83 | 2.83 |
| 1997 | 3.16 | 3.16 |
| 1998 | 3.18 | 3.18 |
| 1999 | 3.62 | 3.62 |
| 2000 | 4.20 | 4.20 |
| 2001 | 4.50 | 4.50 |
| 2002 | 5.16 | 5.16 |
| 2003 | 5.53 | 5.53 |
| 2004 | 5.84 | 5.84 |
| 2005 | 6.38 | 6.38 |
| 2006 | 7.30 | 7.30 |
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