|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | 7.72 |
| 1984 | | 14.33 |
| 1985 | | 246.92 |
| 1986 | | 30.86 |
| 1987 | | 255.74 |
| 1988 | | 106.92 |
| 1989 | | 11.02 |
| 1990 | | 18.83 |
| 1991 | | 214.07 |
| 1992 | | 203.27 |
| 1993 | | 237.44 |
| 1994 | | 67.57 |
| 1995 | | 87.96 |
| 1996 | | 114.75 |
| 1997 | | 116.51 |
| 1998 | | 164.93 |
| 1999 | | 257.50 |
| 2000 | | 102.12 |
| 2001 | | 223.32 |
| 2002 | | 257.30 |
| 2003 | | 1,165.36 |
| 2004 | | 856.63 |
| 2005 | | 524.19 |
| 2006 | | 892.80 |
| 2007 | | 919.32 |
| 2008 | | 957.51 |
| 2009 | | 940.01 |
| 2010 | | 897.95 |
| 2011 | | 1,089.05 |
|
|
