|
| year | production | consumption |
| 1980 | | 290.00 |
| 1981 | 15.00 | 243.00 |
| 1982 | 35.00 | 230.00 |
| 1983 | 45.00 | 219.00 |
| 1984 | 46.00 | 217.00 |
| 1985 | 58.00 | 226.00 |
| 1986 | 76.00 | 222.00 |
| 1987 | 97.00 | 214.00 |
| 1988 | 99.00 | 204.00 |
| 1989 | 117.00 | 196.00 |
| 1990 | 121.00 | 192.00 |
| 1991 | 142.89 | 194.00 |
| 1992 | 162.92 | 192.00 |
| 1993 | 174.11 | 199.00 |
| 1994 | 184.98 | 211.00 |
| 1995 | 186.08 | 223.00 |
| 1996 | 207.92 | 235.00 |
| 1997 | 230.48 | 227.00 |
| 1998 | 238.35 | 223.00 |
| 1999 | 300.20 | 220.00 |
| 2000 | 362.93 | 210.00 |
| 2001 | 346.20 | 213.41 |
| 2002 | 370.76 | 197.16 |
| 2003 | 375.05 | 188.27 |
| 2004 | 389.15 | 185.33 |
| 2005 | 377.15 | 183.46 |
| 2006 | 342.00 | 190.45 |
| 2007 | 311.56 | 190.61 |
| 2008 | 286.51 | 181.05 |
| 2009 | 259.98 | 166.51 |
| 2010 | 245.36 | 167.47 |
| 2011 | 221.15 | 160.20 |
|
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