|
| year | production | consumption |
| 1984 | 3,331.61 | 3,477.64 |
| 1985 | 3,325.41 | 3,509.70 |
| 1986 | 3,434.57 | 3,542.31 |
| 1987 | 3,373.80 | 3,606.86 |
| 1988 | 3,504.77 | 3,754.44 |
| 1989 | 3,585.98 | 3,818.37 |
| 1990 | 3,646.57 | 3,670.91 |
| 1991 | 3,686.39 | 3,566.50 |
| 1992 | 3,682.43 | 3,633.01 |
| 1993 | 3,870.23 | 3,701.72 |
| 1994 | 3,974.63 | 3,883.75 |
| 1995 | 3,887.57 | 3,914.63 |
| 1996 | 4,105.40 | 4,113.54 |
| 1997 | 4,198.17 | 4,223.56 |
| 1998 | 4,233.55 | 4,261.79 |
| 1999 | 4,218.13 | 4,375.06 |
| 2000 | 4,420.22 | 4,556.15 |
| 2001 | 4,563.65 | 4,655.61 |
| 2002 | 4,461.16 | 4,571.02 |
| 2003 | 4,649.11 | 4,773.87 |
| 2004 | 4,783.30 | 4,937.58 |
| 2005 | 4,903.96 | 5,027.30 |
| 2006 | 4,996.97 | 5,097.46 |
| 2007 | 5,106.17 | 5,168.05 |
| 2008 | 5,277.01 | 4,928.47 |
| 2009 | 5,037.61 | 4,549.48 |
| 2010 | 5,202.10 | 4,766.86 |
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