Year	current US$
2006	144429629.6296296
2007	147844444.44444445
2008	156733333.3333333
2009	147951851.85185185
2010	175644444.44444445
2011	188274074.07407406
2012	158362962.96296296
2013	193466666.66666666
2014	272781481.4814815
2015	255899999.99999997
2016	257177777.77777776
2017	213188888.88888887
2018	161955555.55555555