|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 36.42 | 35.36 |
| 1987 | 28.59 | 27.54 |
| 1988 | 29.71 | 27.19 |
| 1989 | 32.21 | 30.23 |
| 1990 | 38.81 | 38.81 |
| 1991 | 38.42 | 37.63 |
| 1992 | 40.60 | 40.59 |
| 1993 | 46.67 | 45.01 |
| 1994 | 48.03 | 48.09 |
| 1995 | 44.12 | 44.12 |
| 1996 | 42.49 | 41.67 |
| 1997 | 32.74 | 32.74 |
| 1998 | 36.53 | 32.52 |
| 1999 | 47.61 | 45.25 |
| 2000 | 44.80 | 34.77 |
| 2001 | 45.60 | 31.13 |
| 2002 | 38.11 | 23.68 |
| 2003 | 33.02 | 29.25 |
| 2004 | 42.78 | 28.45 |
| 2005 | 42.14 | 31.61 |
| 2006 | 42.94 | 37.73 |
| 2007 | 41.40 | 30.00 |
| 2008 | 34.30 | 38.61 |
| 2009 | 28.36 | 35.20 |
| 2010 | 30.99 | 40.35 |
|
|
