|
| year | production | consumption |
| 1980 | | 124.00 |
| 1981 | | 128.00 |
| 1982 | | 125.00 |
| 1983 | | 119.00 |
| 1984 | | 114.50 |
| 1985 | | 110.00 |
| 1986 | | 113.28 |
| 1987 | | 115.60 |
| 1988 | | 120.99 |
| 1989 | | 123.93 |
| 1990 | | 127.39 |
| 1991 | | 133.50 |
| 1992 | | 152.08 |
| 1993 | | 157.51 |
| 1994 | | 179.80 |
| 1995 | | 186.12 |
| 1996 | | 182.68 |
| 1997 | | 185.13 |
| 1998 | | 191.54 |
| 1999 | | 264.03 |
| 2000 | | 244.92 |
| 2001 | | 245.38 |
| 2002 | | 272.63 |
| 2003 | | 276.58 |
| 2004 | | 318.15 |
| 2005 | | 331.30 |
| 2006 | | 318.48 |
| 2007 | | 327.53 |
| 2008 | | 295.95 |
| 2009 | | 353.27 |
| 2010 | | 382.55 |
| 2011 | | 366.00 |
|
|