|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 18.99 | 18.91 |
| 1987 | 17.47 | 22.83 |
| 1988 | 24.30 | 22.76 |
| 1989 | 22.06 | 21.17 |
| 1990 | 24.97 | 22.76 |
| 1991 | 28.58 | 22.30 |
| 1992 | 28.85 | 31.49 |
| 1993 | 53.77 | 41.80 |
| 1994 | 59.23 | 36.14 |
| 1995 | 56.78 | 37.10 |
| 1996 | 34.85 | 39.87 |
| 1997 | 26.11 | 46.86 |
| 1998 | 26.66 | 46.69 |
| 1999 | 23.42 | 37.89 |
| 2000 | 33.03 | 39.98 |
| 2001 | 38.52 | 45.94 |
| 2002 | 34.08 | 45.71 |
| 2003 | 30.30 | 45.16 |
| 2004 | 34.74 | 48.97 |
| 2005 | 35.82 | 49.74 |
| 2006 | 34.00 | 60.04 |
| 2007 | 32.76 | 65.22 |
| 2008 | 33.81 | 64.38 |
| 2009 | 36.29 | 73.75 |
| 2010 | 30.34 | 82.05 |
|
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