Year	current US$
2000	42.38148195
2001	39.51485546
2002	45.27604056
2003	48.01975231
2004	55.97665654
2005	64.51112751
2006	77.7793252
2007	90.4791962
2008	91.31745823
2009	91.00888109
2010	98.85756313
2011	111.95950082
2012	109.00793241
2013	114.40733541
2014	116.97520537
2015	105.05379861
2016	118.98806251
2017	127.24143285
2018	146.11259024
2019	140.10083725
2020	141.64197997
2021	161.19533871