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| year | production | consumption |
| 1980 | 1.85 | 1.85 |
| 1981 | 1.84 | 1.84 |
| 1982 | 2.06 | 2.06 |
| 1983 | 2.14 | 2.14 |
| 1984 | 2.32 | 2.32 |
| 1985 | 2.45 | 2.45 |
| 1986 | 2.69 | 2.69 |
| 1987 | 2.87 | 2.87 |
| 1988 | 3.47 | 3.47 |
| 1989 | 4.13 | 4.13 |
| 1990 | 4.13 | 4.13 |
| 1991 | 4.31 | 4.31 |
| 1992 | 4.34 | 4.34 |
| 1993 | 4.46 | 4.46 |
| 1994 | 4.80 | 4.80 |
| 1995 | 5.34 | 5.34 |
| 1996 | 5.74 | 5.74 |
| 1997 | 6.16 | 6.16 |
| 1998 | 7.52 | 7.52 |
| 1999 | 7.86 | 7.86 |
| 2000 | 9.15 | 9.15 |
| 2001 | 10.43 | 10.43 |
| 2002 | 11.17 | 11.17 |
| 2003 | 11.33 | 11.33 |
| 2004 | 12.20 | 12.20 |
| 2005 | 13.17 | 13.17 |
| 2006 | 14.38 | 14.38 |
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