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| year | production | consumption |
| 1980 | 1.09 | 1.09 |
| 1981 | .85 | .85 |
| 1982 | 9.71 | 9.71 |
| 1983 | 10.86 | 10.86 |
| 1984 | 11.97 | 11.97 |
| 1985 | 12.58 | 12.58 |
| 1986 | 13.73 | 13.73 |
| 1987 | 14.69 | 14.69 |
| 1988 | 15.93 | 15.93 |
| 1989 | 16.98 | 16.98 |
| 1990 | 12.69 | 12.69 |
| 1991 | 13.14 | 13.14 |
| 1992 | 13.34 | 13.34 |
| 1993 | 13.14 | 13.14 |
| 1994 | 14.09 | 14.09 |
| 1995 | 16.22 | 16.22 |
| 1996 | 17.39 | 17.39 |
| 1997 | 18.78 | 18.78 |
| 1998 | 18.29 | 18.29 |
| 1999 | 18.76 | 18.76 |
| 2000 | 18.47 | 18.47 |
| 2001 | 18.82 | 18.82 |
| 2002 | 20.55 | 20.55 |
| 2003 | 21.10 | 21.10 |
| 2004 | 21.73 | 21.73 |
| 2005 | 23.55 | 23.55 |
| 2006 | 25.86 | 25.86 |
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