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| year | production | change |
| 1986 | 5.50 | NA |
| 1987 | 2.20 | -60.00% |
| 1988 | 2.60 | 18.18% |
| 1989 | 2.10 | -19.23% |
| 1990 | 2.20 | 4.76% |
| 1991 | 2.90 | 31.82% |
| 1992 | 2.20 | -24.14% |
| 1993 | 2.80 | 27.27% |
| 1994 | 2.80 | 0.00% |
| 1995 | 2.80 | 0.00% |
| 1996 | 2.80 | 0.00% |
| 1997 | 2.60 | -7.14% |
| 1998 | 2.90 | 11.54% |
| 1999 | 3.00 | 3.45% |
| 2000 | 3.40 | 13.33% |
| 2001 | 2.60 | -23.53% |
| 2002 | 3.30 | 26.92% |
| 2003 | 3.50 | 6.06% |
| 2004 | 3.40 | -2.86% |
| 2005 | 3.30 | -2.94% |
| 2006 | 1.40 | -57.58% |
| 2007 | 1.80 | 28.57% |
| 2008 | 1.60 | -11.11% |
| 2009 | 1.90 | 18.75% |
| 2010 | 2.00 | 5.26% |
| 2011 | 2.30 | 15.00% |
| 2012 | 1.80 | -21.74% |
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