|
| year | production | consumption |
| 1980 | | 28.00 |
| 1981 | | 30.00 |
| 1982 | | 28.00 |
| 1983 | 23.00 | 30.00 |
| 1984 | 27.00 | 29.00 |
| 1985 | 28.00 | 30.00 |
| 1986 | 20.00 | 31.36 |
| 1987 | 18.00 | 35.19 |
| 1988 | 12.00 | 36.97 |
| 1989 | | 36.87 |
| 1990 | | 30.40 |
| 1991 | | 25.00 |
| 1992 | 1.50 | 24.99 |
| 1993 | .50 | 28.43 |
| 1994 | 6.82 | 29.48 |
| 1995 | | 28.88 |
| 1996 | 16.00 | 30.37 |
| 1997 | 18.77 | 27.78 |
| 1998 | 20.00 | 26.77 |
| 1999 | 15.00 | 30.17 |
| 2000 | 11.50 | 32.90 |
| 2001 | 11.00 | 21.72 |
| 2002 | 12.00 | 23.15 |
| 2003 | 19.00 | 22.91 |
| 2004 | 26.00 | 26.87 |
| 2005 | 39.00 | 27.69 |
| 2006 | 62.00 | 27.45 |
| 2007 | 52.00 | 24.84 |
| 2008 | 59.17 | 28.33 |
| 2009 | 57.82 | 26.98 |
| 2010 | 43.83 | 27.55 |
| 2011 | 39.59 | 23.00 |
|
|