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| year | production | change |
| 1980 | 6.90 | NA |
| 1981 | 7.80 | 13.04% |
| 1982 | 8.10 | 3.85% |
| 1983 | 8.30 | 2.47% |
| 1984 | 8.60 | 3.61% |
| 1985 | 9.90 | 15.12% |
| 1986 | 11.00 | 11.11% |
| 1987 | 11.00 | 0.00% |
| 1988 | 11.00 | 0.00% |
| 1989 | 12.00 | 9.09% |
| 1990 | 12.00 | 0.00% |
| 1991 | 14.00 | 16.67% |
| 1992 | 14.00 | 0.00% |
| 1993 | 14.00 | 0.00% |
| 1994 | 15.00 | 7.14% |
| 1995 | 14.00 | -6.67% |
| 1996 | 14.00 | 0.00% |
| 1997 | 15.00 | 7.14% |
| 1998 | 15.00 | 0.00% |
| 1999 | 15.00 | 0.00% |
| 2000 | 14.00 | -6.67% |
| 2001 | 15.00 | 7.14% |
| 2002 | 21.00 | 40.00% |
| 2003 | 19.00 | -9.52% |
| 2004 | 23.00 | 21.05% |
| 2005 | 23.00 | 0.00% |
| 2006 | 22.00 | -4.35% |
| 2007 | 22.00 | 0.00% |
| 2008 | 20.00 | -9.09% |
| 2009 | 19.00 | -5.00% |
| 2010 | 25.00 | 31.58% |
| 2011 | 26.00 | 4.00% |
| 2012 | 27.00 | 3.85% |
| 2013 | 27.00 | 0.00% |
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