|
| year | production | consumption |
| 1980 | 1.10 | 2.20 |
| 1981 | 2.20 | 2.20 |
| 1982 | 2.20 | 2.20 |
| 1983 | 4.41 | 4.41 |
| 1984 | 3.31 | 3.31 |
| 1985 | 4.41 | 4.41 |
| 1986 | 4.41 | 4.41 |
| 1987 | 3.31 | 3.31 |
| 1988 | 3.31 | 3.31 |
| 1989 | 3.31 | 3.31 |
| 1990 | 4.41 | 4.41 |
| 1991 | 4.41 | 4.41 |
| 1992 | 4.41 | 4.41 |
| 1993 | 48.50 | 48.50 |
| 1994 | 50.71 | 50.71 |
| 1995 | 48.50 | 48.50 |
| 1996 | 62.83 | 62.83 |
| 1997 | 30.86 | 30.86 |
| 1998 | 49.60 | 49.60 |
| 1999 | 82.67 | 82.67 |
| 2000 | 87.08 | 87.08 |
| 2001 | 85.98 | 85.98 |
| 2002 | 87.08 | 87.08 |
| 2003 | 60.63 | 60.63 |
| 2004 | 71.65 | 71.65 |
| 2005 | 82.67 | 82.67 |
| 2006 | 88.18 | 88.18 |
| 2007 | 94.80 | 94.80 |
| 2008 | 101.41 | 101.41 |
| 2009 | 108.03 | 108.03 |
| 2010 | 115.74 | 115.74 |
| 2011 | 104.72 | 109.13 |
|
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