Year current US$ 1997 19999.9995529652 1998 19999.9995529652 2007 349999.99403953605 2012 259999.990463257 2013 330000.013113022 2014 310000.002384186 2015 270000.010728836 2016 250000 2017 239999.994635582 2018 419999.986886978 2019 250000 2020 389999.98569488496 2021 310000.002384186 2022 300000.011920929