|
| year | production | consumption |
| 1984 | 41.86 | 49.84 |
| 1985 | 36.56 | 49.23 |
| 1986 | 34.39 | 44.42 |
| 1987 | 29.34 | 44.78 |
| 1988 | 34.01 | 34.67 |
| 1989 | 35.17 | 31.93 |
| 1990 | 30.48 | 30.25 |
| 1991 | 31.62 | 37.15 |
| 1992 | 34.00 | 41.66 |
| 1993 | 37.91 | 46.07 |
| 1994 | 31.47 | 46.23 |
| 1995 | 29.41 | 44.05 |
| 1996 | 26.35 | 39.86 |
| 1997 | 24.74 | 40.24 |
| 1998 | 22.96 | 39.53 |
| 1999 | 24.02 | 36.35 |
| 2000 | 24.05 | 26.77 |
| 2001 | 23.13 | 23.05 |
| 2002 | 7.40 | 13.23 |
| 2003 | 6.48 | 12.44 |
| 2004 | 5.58 | 8.25 |
| 2005 | 3.85 | 4.32 |
| 2006 | 4.22 | 4.07 |
| 2007 | 3.53 | 3.87 |
| 2008 | 3.58 | 3.26 |
| 2009 | 2.92 | 3.98 |
| 2010 | 1.96 | 1.58 |
|
|
