Year	current US$
2000	0.08951981
2001	0.38578846
2002	1.20745357
2003	3.62443909
2004	6.7500407
2005	12.73632958
2006	19.30888194
2007	31.22674385
2008	29.51705479
2009	31.69569758
2010	31.14322024
2011	25.32597792
2012	18.74750711
2013	19.2589566
2014	12.62188356
2015	10.86351919
2016	10.56672711
2017	10.78012762
2018	9.44959603
2019	8.59758762
2020	5.76485185
2021	5.57203351