Year	current US$
2000	10.487486968249316
2001	9.786446906550202
2002	9.12330306434655
2003	14.235720188986031
2004	17.704530745483076
2005	19.984048921886696
2006	23.11420723378913
2007	25.921269311953065
2008	26.87704368161338
2009	27.98783277619366
2010	32.31064765275978
2011	35.46841275978854
2012	34.992609659274784
2013	33.59732919678345
2014	33.14348400618055
2015	30.475079175128702
2016	28.161888288676096
2017	30.665139187083376
2018	31.356710827056023
2019	31.180199222228993
2020	30.683593864045406
2021	34.008221726866644