|
| year | production | consumption |
| 1980 | 74.69 | 185.62 |
| 1981 | 50.75 | 159.20 |
| 1982 | 46.79 | 154.08 |
| 1983 | 42.87 | 157.19 |
| 1984 | 44.96 | 175.20 |
| 1985 | 41.21 | 188.00 |
| 1986 | 39.38 | 182.00 |
| 1987 | 41.00 | 190.14 |
| 1988 | 44.43 | 181.10 |
| 1989 | 46.72 | 195.00 |
| 1990 | 45.00 | 215.00 |
| 1991 | 47.00 | 228.00 |
| 1992 | 51.00 | 223.90 |
| 1993 | 53.00 | 235.48 |
| 1994 | 47.85 | 242.37 |
| 1995 | 52.34 | 262.04 |
| 1996 | 52.69 | 281.50 |
| 1997 | 50.43 | 271.29 |
| 1998 | 55.37 | 278.53 |
| 1999 | 61.45 | 284.57 |
| 2000 | 63.74 | 271.78 |
| 2001 | 61.17 | 287.82 |
| 2002 | 66.39 | 291.07 |
| 2003 | 73.84 | 314.73 |
| 2004 | 69.32 | 310.98 |
| 2005 | 57.81 | 335.88 |
| 2006 | 64.24 | 306.32 |
| 2007 | 68.86 | 313.10 |
| 2008 | 57.07 | 330.83 |
| 2009 | 62.12 | 322.89 |
| 2010 | 63.92 | 353.40 |
| 2011 | 62.72 | 334.61 |
|
|
