|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 24.77 | 6.91 |
| 1987 | 20.57 | 5.78 |
| 1988 | 24.62 | 3.60 |
| 1989 | 24.76 | 4.12 |
| 1990 | 29.48 | 5.47 |
| 1991 | 30.43 | 8.53 |
| 1992 | 29.12 | 8.66 |
| 1993 | 24.49 | 8.36 |
| 1994 | 35.03 | 16.09 |
| 1995 | 39.11 | 15.02 |
| 1996 | 39.11 | 10.49 |
| 1997 | 35.43 | 11.83 |
| 1998 | 39.07 | 9.63 |
| 1999 | 41.55 | 12.77 |
| 2000 | 37.49 | 9.99 |
| 2001 | 33.82 | 8.00 |
| 2002 | 40.94 | 10.16 |
| 2003 | 41.94 | |
| 2004 | 38.93 | 18.98 |
| 2005 | 34.92 | 20.49 |
| 2006 | 36.99 | 23.79 |
| 2007 | 34.29 | 26.53 |
| 2008 | 54.45 | 35.34 |
| 2009 | 41.24 | 20.86 |
| 2010 | 49.23 | 28.21 |
|
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