|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 20.98 | 11.23 |
| 1993 | 16.99 | 11.78 |
| 1994 | 14.02 | 9.07 |
| 1995 | 18.70 | 9.35 |
| 1996 | 21.91 | 10.25 |
| 1997 | 17.90 | 10.35 |
| 1998 | 21.27 | 12.39 |
| 1999 | 26.36 | 11.08 |
| 2000 | 26.38 | 11.14 |
| 2001 | 32.02 | 17.99 |
| 2002 | 30.19 | 17.53 |
| 2003 | 31.81 | 18.37 |
| 2004 | 29.48 | 17.01 |
| 2005 | 30.68 | 17.71 |
| 2006 | 36.55 | 21.10 |
| 2007 | 41.22 | 26.76 |
| 2008 | 37.13 | 21.43 |
| 2009 | 33.04 | 19.07 |
| 2010 | 32.11 | 18.53 |
|
|