|
| year | production | consumption |
| 1980 | 253,517.30 | 221,122.60 |
| 1981 | 218,874.90 | 199,836.90 |
| 1982 | 250,183.90 | 208,031.50 |
| 1983 | 257,526.40 | 212,671.10 |
| 1984 | 266,726.30 | 226,960.40 |
| 1985 | 274,903.20 | 238,406.80 |
| 1986 | 285,871.20 | 247,267.20 |
| 1987 | 293,440.80 | 258,260.50 |
| 1988 | 293,439.70 | 253,079.70 |
| 1989 | 274,675.10 | 242,054.30 |
| 1990 | 237,081.80 | 202,177.10 |
| 1991 | 230,860.40 | 201,676.80 |
| 1992 | 218,439.50 | 191,766.90 |
| 1993 | 218,251.00 | 193,421.50 |
| 1994 | 220,106.20 | 183,862.20 |
| 1995 | 220,944.00 | 184,592.00 |
| 1996 | 222,048.50 | 188,789.60 |
| 1997 | 221,175.50 | 181,895.70 |
| 1998 | 196,556.50 | 168,152.10 |
| 1999 | 188,320.00 | 161,762.00 |
| 2000 | 179,246.70 | 158,488.00 |
| 2001 | 180,046.10 | 151,770.10 |
| 2002 | 178,249.90 | 149,948.80 |
| 2003 | 179,212.70 | 154,154.90 |
| 2004 | 178,260.30 | 153,518.90 |
| 2005 | 174,987.50 | 150,165.70 |
| 2006 | 171,134.90 | 154,818.50 |
| 2007 | 159,773.40 | 149,579.30 |
| 2008 | 157,993.20 | 148,914.50 |
| 2009 | 148,355.70 | 140,908.50 |
| 2010 | 146,256.90 | 147,870.70 |
| 2011 | 152,628.20 | 152,987.60 |
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