|
| year | production | consumption |
| 1980 | | 19.84 |
| 1981 | | 99.21 |
| 1982 | | 36.38 |
| 1983 | | 101.41 |
| 1984 | | 131.18 |
| 1985 | | 95.90 |
| 1986 | | 94.80 |
| 1987 | | 101.41 |
| 1988 | | 125.66 |
| 1989 | | 145.51 |
| 1990 | | 167.55 |
| 1991 | | 146.61 |
| 1992 | | 175.27 |
| 1993 | | 145.51 |
| 1994 | | 136.69 |
| 1995 | | 106.92 |
| 1996 | | 98.11 |
| 1997 | | 101.41 |
| 1998 | | 81.57 |
| 1999 | | 79.37 |
| 2000 | | 72.75 |
| 2001 | | 72.75 |
| 2002 | | 109.13 |
| 2003 | | 101.41 |
| 2004 | | 119.05 |
| 2005 | | 98.11 |
| 2006 | | 132.28 |
| 2007 | | 121.25 |
| 2008 | | 120.15 |
| 2009 | | 104.72 |
| 2010 | | 110.23 |
| 2011 | | 106.92 |
|
|