|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | 4.07 |
| 1987 | | 4.45 |
| 1988 | | 4.50 |
| 1989 | | 4.61 |
| 1990 | | 5.21 |
| 1991 | | 6.01 |
| 1992 | | 6.28 |
| 1993 | | 6.83 |
| 1994 | | 7.65 |
| 1995 | | 8.20 |
| 1996 | | 9.12 |
| 1997 | | 9.92 |
| 1998 | | 9.63 |
| 1999 | | 10.44 |
| 2000 | | 8.04 |
| 2001 | | 8.92 |
| 2002 | | 10.00 |
| 2003 | | 10.00 |
| 2004 | | 10.50 |
| 2005 | | 10.69 |
| 2006 | | 10.80 |
| 2007 | | 9.98 |
| 2008 | | 23.28 |
| 2009 | | 24.29 |
| 2010 | | 32.92 |
|
|