|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 1.41 | 1.41 |
| 1993 | 63.57 | 63.57 |
| 1994 | 68.86 | 68.86 |
| 1995 | 69.22 | 69.22 |
| 1996 | 65.01 | 65.01 |
| 1997 | 61.80 | 61.80 |
| 1998 | 51.21 | 51.21 |
| 1999 | 49.44 | 49.44 |
| 2000 | 58.27 | 58.27 |
| 2001 | 74.16 | 74.16 |
| 2002 | 81.22 | 81.22 |
| 2003 | 80.52 | 80.52 |
| 2004 | 78.75 | 78.75 |
| 2005 | 77.69 | 77.69 |
| 2006 | 102.41 | 148.32 |
| 2007 | 54.03 | 140.20 |
| 2008 | 48.03 | 145.50 |
| 2009 | 37.43 | 126.78 |
| 2010 | 34.26 | 141.61 |
| 2011 | 45.20 | 161.74 |
|
|