Year	current US$
2000	21.99825287
2001	24.10787964
2002	27.20366478
2003	36.11049652
2004	43.03009415
2005	36.86376953
2006	39.08563995
2007	41.32680893
2008	49.78118515
2009	50.8613205
2010	51.81986618
2011	58.30465698
2012	56.95115662
2013	61.02893066
2014	62.2051239
2015	54.20389557
2016	54.93520355
2017	57.67406845
2018	65.77828217
2019	65.75260925
2020	76.77999878
2021	71.22032928