|
| year | production | consumption |
| 1980 | 2,168.00 | 400.00 |
| 1981 | 2,102.00 | 433.00 |
| 1982 | 1,895.00 | 427.00 |
| 1983 | 1,801.00 | 400.00 |
| 1984 | 1,798.00 | 379.00 |
| 1985 | 1,677.00 | 383.24 |
| 1986 | 1,787.00 | 401.56 |
| 1987 | 1,752.00 | 404.41 |
| 1988 | 1,903.00 | 396.93 |
| 1989 | 1,907.00 | 387.65 |
| 1990 | 2,137.00 | 395.59 |
| 1991 | 2,375.00 | 405.00 |
| 1992 | 2,371.00 | 413.81 |
| 1993 | 2,450.00 | 426.95 |
| 1994 | 2,588.00 | 440.28 |
| 1995 | 2,750.14 | 448.47 |
| 1996 | 2,938.00 | 443.81 |
| 1997 | 3,280.00 | 454.57 |
| 1998 | 3,167.01 | 456.76 |
| 1999 | 2,825.80 | 461.21 |
| 2000 | 3,155.00 | 499.71 |
| 2001 | 3,010.00 | 544.47 |
| 2002 | 2,603.95 | 570.67 |
| 2003 | 2,335.19 | 540.64 |
| 2004 | 2,556.94 | 552.85 |
| 2005 | 2,564.66 | 583.15 |
| 2006 | 2,510.55 | 630.98 |
| 2007 | 2,490.30 | 691.10 |
| 2008 | 2,464.02 | 862.39 |
| 2009 | 2,319.45 | 674.68 |
| 2010 | 2,215.75 | 718.19 |
| 2011 | 2,300.00 | 980.00 |
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