|
| year | production | consumption |
| 1980 | | 78.00 |
| 1981 | | 77.00 |
| 1982 | | 73.50 |
| 1983 | | 75.50 |
| 1984 | | 74.50 |
| 1985 | | 64.82 |
| 1986 | | 66.50 |
| 1987 | | 69.81 |
| 1988 | | 67.67 |
| 1989 | | 66.06 |
| 1990 | | 70.34 |
| 1991 | | 70.28 |
| 1992 | | 72.28 |
| 1993 | | 70.90 |
| 1994 | | 81.32 |
| 1995 | | 85.92 |
| 1996 | | 72.28 |
| 1997 | | 76.56 |
| 1998 | | 84.66 |
| 1999 | | 78.40 |
| 2000 | | 77.38 |
| 2001 | | 80.28 |
| 2002 | | 76.59 |
| 2003 | | 77.57 |
| 2004 | | 88.03 |
| 2005 | | 84.30 |
| 2006 | | 86.35 |
| 2007 | | 89.49 |
| 2008 | | 52.01 |
| 2009 | | 97.67 |
| 2010 | | 108.59 |
| 2011 | | 99.00 |
|
|