Year	current US$
2000	7.76253329
2001	9.27101207
2002	9.22128341
2003	12.97907498
2004	15.3247418
2005	16.00190457
2006	18.2733155
2007	15.95975572
2008	19.69091334
2009	18.6223982
2010	14.94522293
2011	18.10525937
2012	16.2733391
2013	16.29164981
2014	15.30515024
2015	13.34956676
2016	13.78545662
2017	13.99899632
2018	16.60759529
2019	15.47073922
2020	25.66122521
2021	18.41486839