|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 1.19 | 2.05 |
| 1987 | 13.86 | 31.62 |
| 1988 | 17.53 | 47.92 |
| 1989 | 16.76 | 41.09 |
| 1990 | 18.95 | 42.36 |
| 1991 | 21.89 | 46.16 |
| 1992 | 26.97 | 50.07 |
| 1993 | 25.15 | 11.74 |
| 1994 | 28.28 | 50.67 |
| 1995 | 28.81 | 56.40 |
| 1996 | 29.24 | 46.33 |
| 1997 | 26.26 | 34.86 |
| 1998 | 31.75 | 10.27 |
| 1999 | 32.58 | 58.01 |
| 2000 | 35.63 | 50.39 |
| 2001 | 93.11 | 46.58 |
| 2002 | 110.45 | 66.50 |
| 2003 | 95.14 | 46.92 |
| 2004 | 120.08 | 85.53 |
| 2005 | 80.34 | 26.31 |
| 2006 | 31.27 | 87.52 |
| 2007 | 30.32 | 102.81 |
| 2008 | | |
| 2009 | 28.61 | 77.68 |
| 2010 | 30.46 | 80.58 |
|
|
