Year	current US$
2000	80.32628605
2001	77.95235606
2002	77.50699367
2003	91.07822701
2004	104.41970965
2005	105.08207123
2006	95.50787578
2007	88.93883826
2008	78.64821746
2009	69.26306086
2010	65.14076214
2011	72.86466598
2012	76.75169893
2013	78.48695536
2014	57.61989952
2015	36.42618375
2016	33.96101964
2017	34.62876285
2018	36.62283147
2019	37.73068246
2020	38.74578466
2021	46.78398952