Year	current US$
2000	0.24833720353558242
2001	0.21906823424820338
2002	0.2386115652944117
2003	0.38594780919125443
2004	0.4533721413924123
2005	0.5219943512497525
2006	0.9225841540622554
2007	1.10130366916817
2008	1.1498553453011582
2019	0.9724066328127695
2020	1.2642300826006763
2021	2.392197172652568