|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 57.13 | 40.90 |
| 1987 | 50.36 | 44.36 |
| 1988 | 54.62 | 41.00 |
| 1989 | 62.00 | 41.09 |
| 1990 | 67.08 | 40.74 |
| 1991 | 75.59 | 38.60 |
| 1992 | 88.53 | 37.58 |
| 1993 | 94.62 | 37.96 |
| 1994 | 94.65 | 38.27 |
| 1995 | 94.80 | 38.06 |
| 1996 | 94.60 | 37.96 |
| 1997 | 94.77 | 39.34 |
| 1998 | 99.14 | 38.56 |
| 1999 | 75.74 | 37.72 |
| 2000 | 88.48 | 37.86 |
| 2001 | 105.27 | 38.01 |
| 2002 | 87.54 | 37.46 |
| 2003 | 80.14 | 37.30 |
| 2004 | 79.31 | 37.28 |
| 2005 | 83.83 | 37.99 |
| 2006 | 86.09 | 39.68 |
| 2007 | 74.01 | 39.52 |
| 2008 | 69.14 | 40.12 |
| 2009 | 76.28 | 43.58 |
| 2010 | 29.11 | 39.97 |
|
|
