Year current US$ 1974 39999.9991059303 1991 740000.009536743 1992 189999.99761581398 1996 9999.99977648258 1999 70000.0002980232 2010 19999.9995529652 2011 29999.999329447703 2016 9999.99977648258 2021 119999.997317791 2022 39999.9991059303