|
| year | production | consumption |
| 1980 | 131,948.90 | 104,765.90 |
| 1981 | 149,326.80 | 116,367.70 |
| 1982 | 154,602.50 | 123,517.30 |
| 1983 | 160,526.30 | 127,346.70 |
| 1984 | 179,597.40 | 137,489.10 |
| 1985 | 191,262.00 | 141,768.30 |
| 1986 | 194,766.30 | 144,634.30 |
| 1987 | 194,615.30 | 148,041.50 |
| 1988 | 199,915.20 | 151,315.40 |
| 1989 | 194,472.00 | 140,487.40 |
| 1990 | 193,181.20 | 139,081.90 |
| 1991 | 196,427.50 | 143,638.50 |
| 1992 | 201,199.30 | 147,390.00 |
| 1993 | 203,044.70 | 146,389.70 |
| 1994 | 215,838.60 | 160,745.00 |
| 1995 | 227,302.10 | 162,260.60 |
| 1996 | 227,475.20 | 163,936.30 |
| 1997 | 244,316.30 | 171,665.20 |
| 1998 | 246,920.00 | 160,838.80 |
| 1999 | 242,993.50 | 169,104.50 |
| 2000 | 248,935.00 | 175,009.60 |
| 2001 | 250,786.90 | 177,859.00 |
| 2002 | 245,766.90 | 170,121.90 |
| 2003 | 263,784.30 | 185,925.90 |
| 2004 | 267,665.90 | 198,820.00 |
| 2005 | 270,050.80 | 193,348.70 |
| 2006 | 269,817.20 | 196,079.10 |
| 2007 | 273,005.00 | 201,156.40 |
| 2008 | 278,017.30 | 216,854.40 |
| 2009 | 275,014.60 | 211,824.60 |
| 2010 | 280,562.50 | 209,403.90 |
| 2011 | 279,000.50 | 201,403.30 |
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