|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 3.40 | 13.80 |
| 1987 | 4.12 | 14.42 |
| 1988 | 3.36 | 15.03 |
| 1989 | 4.12 | 18.62 |
| 1990 | 4.02 | 17.07 |
| 1991 | 3.83 | 14.52 |
| 1992 | 3.14 | 14.64 |
| 1993 | 5.23 | 18.88 |
| 1994 | 5.24 | 19.20 |
| 1995 | 6.14 | 23.69 |
| 1996 | 5.04 | 25.56 |
| 1997 | 5.63 | 25.53 |
| 1998 | 4.32 | 27.43 |
| 1999 | 4.30 | 30.29 |
| 2000 | 5.69 | 27.18 |
| 2001 | 5.61 | 36.67 |
| 2002 | 5.32 | 37.76 |
| 2003 | 7.16 | 37.92 |
| 2004 | 5.59 | 37.12 |
| 2005 | 6.14 | 38.84 |
| 2006 | 5.81 | 42.39 |
| 2007 | 5.27 | 47.23 |
| 2008 | 4.78 | 52.91 |
| 2009 | 4.34 | 59.52 |
| 2010 | 3.93 | 67.21 |
|
|
