Year	current US$
2000	61.79607355
2001	46.90707173
2002	76.01201649
2003	83.83484493
2004	103.61427957
2005	122.99084773
2006	143.14169753
2007	150.6830139
2008	176.85476641
2009	194.35281681
2010	206.10052652
2011	208.77691856
2012	234.39069964
2013	250.67107234
2014	257.47821548
2015	233.92546371
2016	125.52270742
2017	134.01248537
2018	137.09294976
2019	176.49355043
2020	162.28325315
2021	116.39610614