Year current US$ 1972 19999.99955296516 1973 29999.999329447783 1974 29999.999329447703 1975 39999.999105930285 1976 29999.999329447703 1977 59999.9986588955 1978 19999.9995529652 1980 240000.00208616263 1981 69999.998435378 1982 319999.99284744216 1984 9999.99977648258 1985 9999.99977648258 1986 80000.00007450578 1987 129999.995231628 1988 320000.000298023 1989 9999.99977648258 1991 150000.0022351742 1992 170000.00178813902 1993 50000.0007450581 1994 59999.9986588955 1995 90000.0035762787 1997 9999.99977648258 1998 9999.99977648258 2004 39999.9991059303 2015 0 2016 129999.995231628 2017 150000.005960464 2018 19999.9995529652 2022 269999.9921023845