Year	current US$
2000	15.248990996991216
2001	16.439030717735193
2002	16.3749687888933
2003	18.367249903873176
2004	20.60965674032912
2005	23.19537587118382
2006	25.511742509234114
2007	29.860385813383946
2008	32.492461268783316
2009	32.33737039102743
2010	36.78754539054937
2011	39.403092007064664
2012	41.56515839238862
2013	46.84713378911149
2014	47.676679390178045
2015	47.9027666425804
2016	47.212662872063525
2017	44.112594929047575
2018	44.730436145847364
2019	46.21769486357775
2020	46.62959277510775
2021	53.51606807416368