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Loading...
| year | production | consumption |
| 1980 | .34 | .34 |
| 1981 | .40 | .40 |
| 1982 | .46 | .46 |
| 1983 | .53 | .53 |
| 1984 | .52 | .52 |
| 1985 | .58 | .58 |
| 1986 | .51 | .51 |
| 1987 | .54 | .54 |
| 1988 | .64 | .64 |
| 1989 | .62 | .62 |
| 1990 | .68 | .68 |
| 1991 | .68 | .68 |
| 1992 | .74 | .74 |
| 1993 | .80 | .80 |
| 1994 | .96 | .96 |
| 1995 | 1.53 | 1.53 |
| 1996 | 1.80 | 1.80 |
| 1997 | 2.70 | 2.70 |
| 1998 | 3.36 | 3.36 |
| 1999 | 4.96 | 4.96 |
| 2000 | 6.50 | 6.50 |
| 2001 | 8.31 | 8.31 |
| 2002 | 11.63 | 11.63 |
| 2003 | 14.85 | 14.85 |
| 2004 | 18.78 | 18.78 |
| 2005 | 24.43 | 24.43 |
| 2006 | 26.75 | 26.75 |
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