Year	current US$
1997	19999.9995529652
1998	29999.999329447703
2003	59999.9986588955
2004	159999.99642372102
2007	670000.016689301
2008	200000.00298023198
2014	349999.99403953605
2015	79999.9982118607
2017	39999.9991059303