Year	current US$
2000	25.550462292679228
2001	22.902911455818547
2002	20.670146599933023
2003	26.640248077059713
2004	32.5078438910084
2005	32.55142175374692
2006	34.300967374415514
2007	37.7747345568831
2008	38.07593056059104
2009	37.37291291630356
2010	43.06398740367849
2011	46.33037337383099
2012	45.53008100193729
2013	45.86707037806407
2014	43.74185222768812
2015	41.255194178333774
2016	38.29778335856488
2017	37.8364116089446
2018	36.88369415689184
2019	34.656787881102005
2020	29.077002865009206
2021	32.91475318272921