Year	constant 2015 US$
1995	2877.786124003286
1996	3083.1559456009045
1997	3281.236751619587
1998	3462.5149422743975
1999	3659.9162058099496
2000	3939.1015038078426
2001	4136.833545280134
2002	4421.065679280841
2003	4963.609821403226
2004	5565.137866509847
2005	6310.378274910909
2006	6997.058180406237
2007	7963.944008766057
2008	8358.153099986777
2009	6981.631286879286
2010	6909.929038360409
2011	7372.901425643764
2012	7703.053912163941
2013	8116.762012759232
2014	8489.343252671919
2015	8917.06088783126
2016	9399.952957079911
2017	9872.177425995502
2018	10328.746273871717
2019	10640.072633771424
2020	10281.945160768013
2021	11094.765649625568
2022	11197.1947714045
2023	10926.921955765698