|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 8.38 | 6.73 |
| 1987 | 9.93 | 8.18 |
| 1988 | 9.86 | 8.76 |
| 1989 | 10.18 | 9.71 |
| 1990 | 10.96 | 11.56 |
| 1991 | 17.90 | 12.54 |
| 1992 | 19.68 | 15.38 |
| 1993 | 28.89 | 17.21 |
| 1994 | 19.26 | 18.81 |
| 1995 | 80.72 | 15.49 |
| 1996 | 92.07 | 24.36 |
| 1997 | 17.73 | 19.22 |
| 1998 | 75.86 | 25.72 |
| 1999 | 19.26 | 19.80 |
| 2000 | 27.48 | 31.30 |
| 2001 | 24.53 | 30.90 |
| 2002 | 38.36 | 26.44 |
| 2003 | 25.92 | 29.56 |
| 2004 | 27.83 | 37.08 |
| 2005 | 32.19 | 39.31 |
| 2006 | 13.47 | 33.62 |
| 2007 | 27.43 | 40.65 |
| 2008 | 24.79 | 58.44 |
| 2009 | 26.06 | 48.24 |
| 2010 | 22.01 | 120.13 |
|
|
