|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 79.24 | 91.31 |
| 1993 | 67.68 | 84.90 |
| 1994 | 52.85 | 55.27 |
| 1995 | 50.95 | 52.18 |
| 1996 | 54.07 | 50.72 |
| 1997 | 52.30 | 46.40 |
| 1998 | 45.48 | 44.85 |
| 1999 | 30.33 | 31.39 |
| 2000 | 37.90 | 45.95 |
| 2001 | 36.97 | 44.66 |
| 2002 | 39.52 | 48.07 |
| 2003 | 36.50 | 43.70 |
| 2004 | 44.93 | 56.14 |
| 2005 | 52.42 | 62.58 |
| 2006 | 54.80 | 64.43 |
| 2007 | 61.53 | 73.33 |
| 2008 | 58.54 | 70.46 |
| 2009 | 61.07 | 78.03 |
| 2010 | 68.38 | 80.53 |
|
|