Year US Dollars adjusted for inflation) 1950 1096 1951 1263 1952 1150 1953 1060 1954 1107 1955 1122 1956 1156 1957 1183 1958 1173 1959 1101 1960 1159 1961 1111 1962 1176 1963 1182 1964 1223 1965 1243 1966 1328 1967 1338 1968 1255 1969 1295 1970 1134 1971 1157 1972 1206 1973 1161 1974 1229 1975 1181 1976 1143 1977 1175 1978 1237 1979 1251 1980 1261 1981 1237 1982 1237 1983 1195 1984 1195 1985 1149 1986 1237 1987 1266 1988 1307 1989 1333 1990 1351 1991 1336 1992 1280 1993 1258 1994 1261 1995 1281 1996 1301 1997 1305 1998 1285 1999 1253 2000 1268 2001 1257 2002 1216 2003 1218