I mmm em — ne me no em me soe me fle er st ee t= ee 8% o 2 co @ $B AID mee me me a ae ee ee ll — a re ae es ln — ee a Ss a St 3 = o < = 6% @ > E B 80 Nf Nf EQ fe Nef = fom — £ a @ E S 60 ----- Qf ge NB 4% @ > 2 g m 40 --------------------- P-gp 2% 20 Th - seo 0 0% 1962 1966 1970 1974 1978 1982 1986 1990 1994 1998