|
| year | production | consumption |
| 1980 | 23,061.49 | 22,558.69 |
| 1981 | 22,819.65 | 22,111.53 |
| 1982 | 21,588.15 | 20,802.96 |
| 1983 | 19,682.39 | 19,643.11 |
| 1984 | 21,261.52 | 20,913.96 |
| 1985 | 20,494.18 | 20,436.43 |
| 1986 | 19,806.16 | 19,231.04 |
| 1987 | 20,622.17 | 20,215.82 |
| 1988 | 21,581.95 | 21,264.78 |
| 1989 | 21,903.47 | 22,426.57 |
| 1990 | 22,561.98 | 22,469.62 |
| 1991 | 22,654.30 | 22,911.48 |
| 1992 | 23,238.92 | 23,782.53 |
| 1993 | 23,954.99 | 24,457.25 |
| 1994 | 25,061.84 | 25,010.81 |
| 1995 | 25,158.79 | 26,122.12 |
| 1996 | 25,628.94 | 26,628.87 |
| 1997 | 25,830.38 | 26,802.46 |
| 1998 | 26,266.12 | 26,327.21 |
| 1999 | 26,384.41 | 26,774.74 |
| 2000 | 26,966.17 | 27,722.55 |
| 2001 | 27,514.84 | 26,755.75 |
| 2002 | 26,893.02 | 27,693.41 |
| 2003 | 26,952.56 | 27,289.65 |
| 2004 | 26,326.01 | 27,397.28 |
| 2005 | 25,960.39 | 27,074.18 |
| 2006 | 26,792.50 | 27,205.63 |
| 2007 | 27,360.20 | 28,244.06 |
| 2008 | 27,898.85 | 28,416.89 |
| 2009 | 27,979.44 | 28,107.63 |
| 2010 | 28,504.44 | 29,286.11 |
| 2011 | 29,880.92 | 29,912.82 |
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