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Loading...
| year | production | consumption |
| 1980 | .29 | .29 |
| 1981 | .28 | .28 |
| 1982 | .25 | .25 |
| 1983 | .21 | .21 |
| 1984 | .22 | .22 |
| 1985 | .30 | .30 |
| 1986 | .45 | .45 |
| 1987 | .51 | .51 |
| 1988 | .57 | .57 |
| 1989 | .62 | .62 |
| 1990 | .70 | .70 |
| 1991 | .78 | .78 |
| 1992 | .83 | .83 |
| 1993 | .84 | .84 |
| 1994 | .85 | .85 |
| 1995 | 1.00 | 1.00 |
| 1996 | 1.01 | 1.01 |
| 1997 | .86 | .86 |
| 1998 | .96 | .96 |
| 1999 | 1.15 | 1.15 |
| 2000 | 1.28 | 1.28 |
| 2001 | 1.54 | 1.54 |
| 2002 | 1.63 | 1.63 |
| 2003 | 1.63 | 1.63 |
| 2004 | 1.99 | 1.99 |
| 2005 | 2.36 | 2.36 |
| 2006 | 3.30 | 3.30 |
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