Year	current US$
2000	14.87743694
2001	14.64844474
2002	16.04762353
2003	20.17915515
2004	21.93851058
2005	23.25929389
2006	26.48448527
2007	28.77688134
2008	30.69551324
2009	30.96524295
2010	40.12282443
2011	39.43065125
2012	41.14995279
2013	43.96442048
2014	46.62886482
2015	38.67990633
2016	41.41608481
2017	44.98750495
2018	46.68150375
2019	46.54638289
2020	40.8951711
2021	45.90068947