|
| year | production | consumption |
| 1980 | 85.00 | 85.00 |
| 1981 | 85.00 | 85.00 |
| 1982 | 49.00 | 49.00 |
| 1983 | 46.00 | 46.00 |
| 1984 | 48.00 | 48.00 |
| 1985 | 44.00 | 44.00 |
| 1986 | 26.00 | 26.00 |
| 1987 | 25.80 | 25.78 |
| 1988 | 35.32 | 35.32 |
| 1989 | 56.86 | 56.86 |
| 1990 | 66.00 | 66.00 |
| 1991 | 52.00 | 52.00 |
| 1992 | 55.44 | 54.44 |
| 1993 | 61.80 | 61.80 |
| 1994 | 68.51 | 68.51 |
| 1995 | 67.10 | 67.10 |
| 1996 | 63.92 | 63.92 |
| 1997 | 75.22 | 98.88 |
| 1998 | 70.28 | 114.07 |
| 1999 | 42.38 | 162.10 |
| 2000 | 40.26 | 183.99 |
| 2001 | 42.38 | 223.90 |
| 2002 | 38.85 | 227.43 |
| 2003 | 65.33 | 279.34 |
| 2004 | 38.49 | 292.76 |
| 2005 | 72.04 | 301.59 |
| 2006 | 69.22 | 265.57 |
| 2007 | 62.79 | 157.05 |
| 2008 | 61.20 | 97.19 |
| 2009 | 68.02 | 114.84 |
| 2010 | 65.44 | 187.03 |
| 2011 | 51.98 | 198.61 |
|
|
