|
| year | production | consumption |
| 1980 | | 12.00 |
| 1981 | | 12.00 |
| 1982 | | 12.00 |
| 1983 | | 12.00 |
| 1984 | | 13.60 |
| 1985 | | 14.35 |
| 1986 | | 14.49 |
| 1987 | | 16.07 |
| 1988 | | 15.01 |
| 1989 | | 15.38 |
| 1990 | | 15.60 |
| 1991 | .20 | 15.47 |
| 1992 | 53.00 | 15.36 |
| 1993 | 125.88 | 15.34 |
| 1994 | 110.00 | 15.00 |
| 1995 | 100.00 | 15.18 |
| 1996 | 103.36 | 15.14 |
| 1997 | 80.00 | 15.45 |
| 1998 | 79.06 | 14.83 |
| 1999 | 96.60 | 14.83 |
| 2000 | 70.06 | 14.94 |
| 2001 | 67.50 | 14.98 |
| 2002 | 55.15 | 22.04 |
| 2003 | 50.49 | 25.18 |
| 2004 | 45.58 | 25.02 |
| 2005 | 40.28 | 25.08 |
| 2006 | 44.39 | 26.53 |
| 2007 | 41.99 | 26.44 |
| 2008 | 38.08 | 19.74 |
| 2009 | 34.83 | 19.73 |
| 2010 | 30.36 | 19.90 |
| 2011 | 30.00 | 45.00 |
|
|