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| year | production | consumption |
| 1980 | .74 | .74 |
| 1981 | .91 | .91 |
| 1982 | .99 | .99 |
| 1983 | 1.41 | 1.41 |
| 1984 | 1.80 | 1.80 |
| 1985 | 1.75 | 1.75 |
| 1986 | 1.94 | 1.94 |
| 1987 | 1.93 | 1.93 |
| 1988 | 2.01 | 2.01 |
| 1989 | 2.20 | 2.20 |
| 1990 | 1.80 | 1.80 |
| 1991 | 1.74 | 1.74 |
| 1992 | 1.98 | 1.98 |
| 1993 | 2.17 | 2.17 |
| 1994 | 2.23 | 2.23 |
| 1995 | 2.40 | 2.40 |
| 1996 | 2.22 | 2.22 |
| 1997 | 2.89 | 2.89 |
| 1998 | 3.20 | 3.20 |
| 1999 | 3.08 | 3.08 |
| 2000 | 4.56 | 4.56 |
| 2001 | 4.28 | 4.28 |
| 2002 | 4.79 | 4.79 |
| 2003 | 5.24 | 5.24 |
| 2004 | 8.41 | 8.41 |
| 2005 | 8.83 | 8.83 |
| 2006 | 9.83 | 9.83 |
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