Year	constant 2015 US$
1997	518623.75234032684
1998	326249.98392178275
1999	1963258.0703175336
2000	2649511.7936460907
2001	3469458.865412682
2002	3308085.9521290837
2003	4828595.081798147
2004	5577604.7526336415
2005	1111823.6502653118
2006	2721934.542447172
2007	4706902.89115428
2008	4367686.154113545
2009	7250972.39058903
2010	10124759.553254506
2011	9839027.26046328
2012	6520838.797050891
2013	6752193.052684743
2014	8147160.2465965
2015	5796750.06866455
2016	3790024.1154760355
2017	2796798.697699082
2018	3875144.800426011
2019	3635414.184163555
2020	3535896.1152930483
2021	2935926.9173040846
2022	3099977.509869827