Year	constant 2015 US$
1995	3654.833568979478
1996	3600.4021920108835
1997	2806.0082181343255
1998	2908.9369464423407
1999	2699.4860621194266
2000	2815.1488422873495
2001	3085.2366106371446
2002	3409.8928431538793
2003	3599.6978992901422
2004	3901.4608140879936
2005	4126.202497191398
2006	4362.318018503623
2007	4526.14386544277
2008	5069.477698517025
2009	5067.375529410486
2010	5164.125039765506
2011	5398.24651760883
2012	5554.032822982898
2013	5504.671479842643
2014	5659.924208271822
2015	5819.877624434734
2016	6168.826898029505
2017	6457.208011625514
2018	6639.2413724211
2019	7114.711127666627
2020	7001.4704285139715
2021	7649.834280318878