CH3A1980CH3A1981CH3A1982CH3A1983CH3A1984CH3A1985CH3A1987CH3A1988CH3A1989CH3A1990CH3A1991CH3A1992CH3A1993CH3A1994CH3A1995CH3A1996CH3A1997CH3A1998CH3A1999CH3A2000