Year	current US$
2000	18.65084755
2001	18.05566277
2002	20.02482408
2003	37.4900203
2004	34.24579717
2005	38.66972436
2006	4.3067378
2007	14.17000046
2008	13.21507894
2009	17.91929908
2010	22.19719784
2011	28.19325464
2012	28.0577621
2013	41.62427561
2014	41.78872297
2015	26.72348189
2016	44.03292413
2017	53.61149107
2018	48.00301565
2019	43.28393153
2020	64.4512156
2021	79.7833385