|
| year | production | consumption |
| 1980 | | 380.00 |
| 1981 | | 340.00 |
| 1982 | | 330.00 |
| 1983 | | 337.00 |
| 1984 | | 384.00 |
| 1985 | | 378.00 |
| 1986 | | 405.26 |
| 1987 | | 419.82 |
| 1988 | | 482.63 |
| 1989 | | 521.31 |
| 1990 | | 541.51 |
| 1991 | 2.25 | 545.26 |
| 1992 | | 557.10 |
| 1993 | 1.13 | 616.43 |
| 1994 | 1.30 | 658.66 |
| 1995 | 1.22 | 736.90 |
| 1996 | 1.22 | 780.35 |
| 1997 | | 775.00 |
| 1998 | .93 | 807.80 |
| 1999 | .80 | 852.64 |
| 2000 | .74 | 865.30 |
| 2001 | .80 | 881.72 |
| 2002 | .88 | 893.74 |
| 2003 | .92 | 929.90 |
| 2004 | .80 | 948.02 |
| 2005 | .80 | 939.49 |
| 2006 | .80 | 959.91 |
| 2007 | .80 | 952.50 |
| 2008 | .80 | 888.79 |
| 2009 | .80 | 933.26 |
| 2010 | .80 | 971.99 |
| 2011 | .80 | 929.00 |
|
|