|
| year | production | consumption |
| 1984 | 80.63 | 90.54 |
| 1985 | 61.15 | 92.51 |
| 1986 | 69.09 | 91.44 |
| 1987 | 75.20 | 97.63 |
| 1988 | 72.58 | 79.17 |
| 1989 | 83.20 | 77.14 |
| 1990 | 86.09 | 88.80 |
| 1991 | 81.42 | 87.75 |
| 1992 | 85.54 | 80.98 |
| 1993 | 86.70 | 73.82 |
| 1994 | 98.87 | 61.73 |
| 1995 | 100.59 | 61.98 |
| 1996 | 119.15 | 56.70 |
| 1997 | 121.31 | 66.17 |
| 1998 | 116.03 | 68.22 |
| 1999 | 123.02 | 64.81 |
| 2000 | 116.81 | 67.07 |
| 2001 | 126.33 | 61.28 |
| 2002 | 148.19 | 65.50 |
| 2003 | 151.94 | 63.87 |
| 2004 | 160.62 | 68.63 |
| 2005 | 145.53 | 61.52 |
| 2006 | 129.32 | 51.61 |
| 2007 | 41.67 | 57.49 |
| 2008 | 41.61 | 193.83 |
| 2009 | 43.88 | 166.35 |
| 2010 | 45.29 | 163.71 |
|
|
