In 2010, bills to abolish the death penalty in Kansas and in South Dakota (which had a de facto moratorium at the time) were rejected. Idaho ended its de facto moratorium, during which only one volunteer had been executed, on November 18, 2011 by executing Paul Ezra Rhoades; South Dakota executed Donald Moeller on October 30, 2012, ending a de facto moratorium during which only two volunteers had been executed. Of the 12 prisoners whom Nevada has executed since 1976, 11 waived their rights to appeal. Kentucky and Montana have executed two prisoners against their will (KY: 1997 and 1999, MT: 1995 and 1998) and one volunteer, respectively (KY: 2008, MT: 2006). Colorado (in 1997) and Wyoming (in 1992) have executed only one prisoner, respectively.
Try to answer this question if possible (otherwise reply "unanswerable"): Since 1976, in what year was a prisoner executed in Wyoming?
1992