Year	constant 2015 US$
1995	6163.44811295956
1996	6517.6811134371965
1997	6670.558561392384
1998	6877.5313517889
1999	6999.5349830521745
2000	7298.6105293137925
2001	7603.602209222629
2002	7956.071844095305
2003	8244.625906011168
2004	8665.954123207013
2005	9152.28418436575
2006	9669.345936320105
2007	10275.131660831557
2008	10801.566810760767
2009	10508.865098578326
2010	10612.886144421644
2011	10931.495854038405
2012	11056.259435258591
2013	11213.12791626126
2014	11620.30983095818
2015	12087.19242080693
2016	12479.647855442885
2017	13124.131288749211
2018	13774.002481436555
2019	14353.257323647062
2020	14009.497623840007
2021	14857.587609766277
2022	15503.975764754034