|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | 40.36 |
| 1987 | 39.24 | 49.64 |
| 1988 | 26.77 | 45.95 |
| 1989 | 25.85 | 37.65 |
| 1990 | 45.19 | 45.67 |
| 1991 | 54.86 | 56.09 |
| 1992 | 42.83 | 52.87 |
| 1993 | 86.34 | 50.98 |
| 1994 | 63.54 | 52.08 |
| 1995 | 27.70 | 50.50 |
| 1996 | 28.29 | 51.66 |
| 1997 | 26.03 | 53.50 |
| 1998 | 20.55 | 54.50 |
| 1999 | 17.81 | 28.77 |
| 2000 | 18.58 | 62.95 |
| 2001 | 2.03 | 72.14 |
| 2002 | 5.23 | 69.20 |
| 2003 | 16.70 | 83.00 |
| 2004 | 19.52 | 79.56 |
| 2005 | 19.58 | 77.41 |
| 2006 | 20.45 | 66.73 |
| 2007 | 19.10 | 53.48 |
| 2008 | 9.13 | 47.59 |
| 2009 | 9.76 | 61.84 |
| 2010 | | 48.00 |
|
|