|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 34.68 | 14.38 |
| 1993 | 28.61 | 18.27 |
| 1994 | 23.52 | 18.70 |
| 1995 | 24.54 | 14.32 |
| 1996 | 18.85 | 9.31 |
| 1997 | 31.09 | 17.96 |
| 1998 | 32.21 | 7.32 |
| 1999 | 39.25 | 7.34 |
| 2000 | 45.83 | 14.01 |
| 2001 | 40.70 | 21.08 |
| 2002 | 48.26 | 19.95 |
| 2003 | 50.67 | 18.71 |
| 2004 | 51.21 | 18.92 |
| 2005 | 53.29 | 19.69 |
| 2006 | 63.49 | 23.45 |
| 2007 | 59.43 | 33.06 |
| 2008 | 64.52 | 23.81 |
| 2009 | 57.44 | 21.22 |
| 2010 | 55.82 | 20.63 |
|
|