|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 20.58 | 15.85 |
| 1993 | 30.85 | 11.15 |
| 1994 | 24.23 | 10.14 |
| 1995 | 20.05 | 14.65 |
| 1996 | 30.18 | 15.06 |
| 1997 | 38.89 | 15.17 |
| 1998 | 49.36 | 14.82 |
| 1999 | 31.99 | 11.54 |
| 2000 | 29.16 | 14.86 |
| 2001 | 49.08 | 23.37 |
| 2002 | 40.17 | 16.92 |
| 2003 | 43.98 | 7.20 |
| 2004 | 54.33 | 6.41 |
| 2005 | 57.54 | 8.95 |
| 2006 | 54.76 | 10.03 |
| 2007 | 37.72 | 9.49 |
| 2008 | 62.77 | 8.04 |
| 2009 | 60.41 | 6.19 |
| 2010 | 62.51 | 4.56 |
|
|