Year	constant 2015 US$
1991	4618.9480261462095
1992	4654.07094360465
1993	4730.514722181337
1994	4923.581471188007
1995	4938.9118774697445
1996	5240.675870436597
1997	5033.241041931612
1998	5482.745328998497
1999	5271.486024815338
2000	5347.452904601355
2001	5734.114160941461
2002	6136.262840604892
2003	6013.94890016328
2004	5882.6294952365015
2005	6185.040670038251
2006	6470.835994151918
2007	6158.830342411284
2008	5965.4677050106075
2009	6523.022542415979
2010	6884.788017608167
2011	7363.789870879996
2012	7641.02209127639
2013	8010.779939375898
2014	8133.39836367766
2015	8409.735120782536
2016	8619.723566123359
2017	8898.397990623189
2018	9537.595316935944
2019	10203.544946102627
2020	10951.57295406693
2021	11136.184228911883
2022	10795.126343843845