Year Average 1990 = 100 1975-12-31 77.39 1976-12-31 79.85 1977-12-31 83.45 1978-12-31 84.01 1979-12-31 85.26 1980-12-31 87.83 1981-12-31 87.02 1982-12-31 89.85 1983-12-31 91.9 1984-12-31 91.84 1985-12-31 92.33 1986-12-31 95.91 1987-12-31 98.49 1988-12-31 98.22 1989-12-31 97.89 1990-12-31 100 1991-12-31 99.58 1992-12-31 101.34 1993-12-31 103.98 1994-12-31 104.02 1995-12-31 106.94 1996-12-31 105.23 1997-12-31 102.89 1998-12-31 103.12 1999-12-31 102 2000-12-31 99.84 2001-12-31 100.2