Year	current US$
2006	37801333.33333333
2007	38941481.48148148
2008	51611259.259259254
2009	51135888.88888889
2010	39885185.18518518
2011	36785185.18518518
2012	37859259.259259254
2013	43566666.666666664
2014	38777777.777777776
2015	38911111.11111111
2016	38814814.81481481
2017	31211111.11111111
2018	33570370.370370366
2019	36259259.259259254
2020	29688888.888888888
2021	31970370.37037037
2022	35462962.96296296
2023	23181481.48148148