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| year | production | consumption |
| 1980 | 127.30 | 112.98 |
| 1981 | 135.20 | 118.89 |
| 1982 | 143.91 | 127.89 |
| 1983 | 145.71 | 131.60 |
| 1984 | 155.02 | 140.80 |
| 1985 | 167.43 | 151.12 |
| 1986 | 178.53 | 163.21 |
| 1987 | 187.64 | 171.33 |
| 1988 | 202.86 | 184.54 |
| 1989 | 211.96 | 192.74 |
| 1990 | 226.17 | 205.75 |
| 1991 | 232.28 | 213.86 |
| 1992 | 237.29 | 216.87 |
| 1993 | 246.49 | 227.18 |
| 1994 | 256.70 | 235.39 |
| 1995 | 262.91 | 239.50 |
| 1996 | 275.03 | 252.62 |
| 1997 | 289.05 | 264.53 |
| 1998 | 304.67 | 279.05 |
| 1999 | 315.58 | 286.16 |
| 2000 | 331.99 | 302.47 |
| 2001 | 353.71 | 317.99 |
| 2002 | 365.71 | 329.20 |
| 2003 | 370.22 | 334.70 |
| 2004 | 386.42 | 350.80 |
| 2005 | 386.74 | 354.32 |
| 2006 | 397.75 | 363.23 |
| 2007 | 416.95 | 384.23 |
| 2008 | 422.96 | 389.14 |
| 2009 | 434.96 | 400.24 |
| 2010 | 452.37 | 416.65 |
| 2011 | 465.27 | 431.55 |
| 2012 | 472.97 | 439.15 |
| 2013 | 496.17 | 456.25 |
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