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| year | production | change |
| 1980 | 11.00 | NA |
| 1981 | 4.00 | -63.64% |
| 1982 | 3.00 | -25.00% |
| 1983 | 7.00 | 133.33% |
| 1984 | 7.10 | 1.43% |
| 1985 | 7.30 | 2.82% |
| 1986 | 7.50 | 2.74% |
| 1987 | 6.90 | -8.00% |
| 1988 | 6.70 | -2.90% |
| 1989 | 7.70 | 14.93% |
| 1990 | 7.90 | 2.60% |
| 1991 | 7.70 | -2.53% |
| 1992 | 8.30 | 7.79% |
| 1993 | 8.50 | 2.41% |
| 1994 | 8.20 | -3.53% |
| 1995 | 8.80 | 7.32% |
| 1996 | 8.80 | 0.00% |
| 1997 | 11.00 | 25.00% |
| 1998 | 11.00 | 0.00% |
| 1999 | 10.00 | -9.09% |
| 2000 | 13.00 | 30.00% |
| 2001 | 15.00 | 15.38% |
| 2002 | 15.00 | 0.00% |
| 2003 | 15.00 | 0.00% |
| 2004 | 13.00 | -13.33% |
| 2005 | 16.00 | 23.08% |
| 2006 | 15.00 | -6.25% |
| 2007 | 14.00 | -6.67% |
| 2008 | 13.00 | -7.14% |
| 2009 | 10.00 | -23.08% |
| 2010 | 11.00 | 10.00% |
| 2011 | 12.00 | 9.09% |
| 2012 | 13.00 | 8.33% |
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