Year	current US$
2006	18349999.796599198
2007	19230000.132694803
2008	20230000.1028925
2009	19029999.9788404
2010	23979999.646544497
2011	16739999.830722801
2012	20209999.937564097
2013	22629999.8611212
2014	23819999.7786433
2015	19828874.1465658
2016	20699881.2267557
2017	23041246.3662215
2018	25605827.8121054
2019	23800550.542771798
2020	22284660.3132784
2021	22460941.0315752
2022	16380291.059613228