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| year | production | change |
| 1980 | 3.99 | NA |
| 1981 | 2.63 | -34.14% |
| 1982 | 1.95 | -25.99% |
| 1983 | 2.51 | 29.20% |
| 1984 | 2.76 | 9.87% |
| 1985 | 2.44 | -11.63% |
| 1986 | 3.36 | 37.83% |
| 1987 | 3.77 | 12.01% |
| 1988 | 3.63 | -3.72% |
| 1989 | 4.32 | 19.00% |
| 1990 | 2.83 | -34.38% |
| 1991 | .43 | -84.85% |
| 1992 | 2.44 | 469.23% |
| 1993 | 4.28 | 75.43% |
| 1994 | 4.73 | 10.34% |
| 1995 | 4.81 | 1.80% |
| 1996 | 4.94 | 2.70% |
| 1997 | 4.85 | -1.92% |
| 1998 | 5.02 | 3.47% |
| 1999 | 4.60 | -8.33% |
| 2000 | 5.04 | 9.55% |
| 2001 | 4.81 | -4.41% |
| 2002 | 4.58 | -4.84% |
| 2003 | 5.14 | 12.25% |
| 2004 | 5.71 | 10.97% |
| 2005 | 6.11 | 7.05% |
| 2006 | 6.13 | 0.28% |
| 2007 | 5.97 | -2.48% |
| 2008 | 6.28 | 5.14% |
| 2009 | 5.68 | -9.52% |
| 2010 | 5.62 | -1.02% |
| 2011 | 6.19 | 10.03% |
| 2012 | 6.52 | 5.32% |
| 2013 | 6.56 | 0.71% |
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