Year	current US$
2005	20760000000
2006	19137000000
2007	21662000000
2008	26446000000
2009	26331000000
2010	26318000000
2011	30302000000
2012	31566000000
2013	37984000000
2014	40028000000
2015	35648000000
2016	26505000000
2017	31993000000
2018	36791000000
2019	41415000000
2020	13771000000