Year	current US$
1977	19999.9995529652
1985	39999.9991059303
1993	29999.999329447703
1994	119999.997317791
1995	79999.9982118607
2000	230000.004172325
2011	79999.9982118607
2012	579999.983310699
2013	70000.0002980232
2014	29999.999329447703
2015	50000.0007450581
2016	9999.99977648258
2017	109999.999403954
2018	0