Year	constant 2015 US$
2006	21145.104240786823
2007	25108.56981678574
2008	26224.18804810329
2009	26501.69363187092
2010	29136.185691938033
2011	28803.023197825918
2012	36713.17112530865
2013	36415.724047761054
2014	35194.10383373134
2015	32180.032296558285
2016	31546.876792257037
2017	30482.329249423827
2018	27840.567326470347
2019	27673.51927598911
2020	20136.85078587778
2021	25275.97357150216
2022	31667.047583813848