Sorry, i think the extra open parenthesis is doing that.
SELECT a.name, a.empnumber, b.[1981], b.[1982], b.[1983], b.[1984], b.[1985], b.[1986], b.[1987], b.[1988], b.[1989], b.[1990], d.[1991], d.[1992], d.[1993], d.[1994], d.[1995], d.[1996], d.[1997], d.[1998], d.[1999], d.[2000]...