|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | |
| 1993 | 25.77 | 17.15 |
| 1994 | 30.44 | 16.97 |
| 1995 | 34.38 | 18.61 |
| 1996 | 35.16 | 17.52 |
| 1997 | 36.42 | 17.84 |
| 1998 | 38.80 | 18.13 |
| 1999 | 38.63 | 17.70 |
| 2000 | 43.33 | 17.15 |
| 2001 | 45.58 | 18.12 |
| 2002 | 47.85 | 21.36 |
| 2003 | 48.05 | 18.80 |
| 2004 | 53.77 | 19.95 |
| 2005 | 53.65 | 22.77 |
| 2006 | 54.95 | 24.26 |
| 2007 | 59.87 | 27.49 |
| 2008 | 59.92 | 29.67 |
| 2009 | 59.52 | 26.30 |
| 2010 | 58.64 | 32.54 |
|
|