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| year | production | change |
| 1980 | 4.03 | NA |
| 1981 | 2.57 | -36.11% |
| 1982 | 2.61 | 1.52% |
| 1983 | 2.52 | -3.44% |
| 1984 | 2.53 | 0.12% |
| 1985 | 2.46 | -2.53% |
| 1986 | 2.43 | -1.14% |
| 1987 | 2.29 | -5.75% |
| 1988 | 2.74 | 19.22% |
| 1989 | 2.70 | -1.24% |
| 1990 | 3.18 | 17.85% |
| 1991 | 3.43 | 7.82% |
| 1992 | 3.34 | -2.62% |
| 1993 | 3.17 | -5.18% |
| 1994 | 3.21 | 1.14% |
| 1995 | 3.23 | 0.72% |
| 1996 | 3.28 | 1.49% |
| 1997 | 3.39 | 3.36% |
| 1998 | 3.26 | -3.72% |
| 1999 | 3.07 | -5.89% |
| 2000 | 3.30 | 7.50% |
| 2001 | 3.21 | -2.76% |
| 2002 | 3.11 | -2.96% |
| 2003 | 3.30 | 6.07% |
| 2004 | 3.61 | 9.33% |
| 2005 | 3.99 | 10.56% |
| 2006 | 4.22 | 5.84% |
| 2007 | 4.37 | 3.39% |
| 2008 | 4.47 | 2.27% |
| 2009 | 4.27 | -4.30% |
| 2010 | 4.31 | 0.77% |
| 2011 | 1.32 | -69.28% |
| 2012 | 3.53 | 166.59% |
| 2013 | 2.48 | -29.57% |
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