|
| year | production | consumption |
| 1980 | | 203.93 |
| 1981 | | 238.10 |
| 1982 | | 238.10 |
| 1983 | | 440.92 |
| 1984 | | 385.81 |
| 1985 | | 615.09 |
| 1986 | | 507.06 |
| 1987 | | 842.17 |
| 1988 | | 765.00 |
| 1989 | | 663.59 |
| 1990 | | 682.42 |
| 1991 | | 781.31 |
| 1992 | | 827.40 |
| 1993 | | 890.12 |
| 1994 | | 754.86 |
| 1995 | | 774.32 |
| 1996 | | 840.66 |
| 1997 | | 750.26 |
| 1998 | | 805.22 |
| 1999 | | 980.25 |
| 2000 | | 1,115.23 |
| 2001 | | 908.57 |
| 2002 | | 1,592.44 |
| 2003 | | 3,523.14 |
| 2004 | | 3,232.90 |
| 2005 | | 2,861.62 |
| 2006 | | 3,667.81 |
| 2007 | | 3,748.50 |
| 2008 | | 3,628.60 |
| 2009 | | 3,454.28 |
| 2010 | | 3,673.93 |
| 2011 | | 3,878.53 |
|
|
