|
| year | production | consumption |
| 1980 | 43.00 | 43.00 |
| 1981 | 53.04 | 53.04 |
| 1982 | 47.00 | 32.00 |
| 1983 | 47.00 | 47.00 |
| 1984 | 52.00 | 52.00 |
| 1985 | 50.00 | 50.00 |
| 1986 | 40.00 | 40.00 |
| 1987 | 43.20 | 43.20 |
| 1988 | 24.01 | 24.01 |
| 1989 | 50.15 | 50.15 |
| 1990 | 80.00 | 80.00 |
| 1991 | 34.35 | 105.00 |
| 1992 | 31.08 | 114.66 |
| 1993 | 29.31 | 111.24 |
| 1994 | 32.49 | 140.55 |
| 1995 | 33.55 | 150.80 |
| 1996 | 32.14 | 156.80 |
| 1997 | 32.84 | 186.82 |
| 1998 | 31.43 | 218.95 |
| 1999 | 31.43 | 220.37 |
| 2000 | 31.43 | 242.61 |
| 2001 | 30.02 | 241.55 |
| 2002 | 32.84 | 287.11 |
| 2003 | 29.31 | 293.47 |
| 2004 | 30.02 | 352.44 |
| 2005 | 28.25 | 367.63 |
| 2006 | 15.19 | 375.40 |
| 2007 | 13.42 | 402.24 |
| 2008 | 10.95 | 411.77 |
| 2009 | 10.95 | 427.31 |
| 2010 | 9.18 | 535.38 |
| 2011 | 10.24 | 572.46 |
|
|
