Year	current US$
1995	8866.38556450023
1996	8816.642951705599
1997	8506.336668778766
1998	9056.420571083689
1999	9342.004614291405
2000	8153.5588883672335
2001	8430.810763312049
2002	9454.250855727114
2003	11914.581967327544
2004	13735.101934917015
2005	14480.695177119522
2006	15741.01805502016
2007	18967.712254935726
2008	21884.905307149696
2009	19537.19566441212
2010	18501.496359388464
2011	19709.88523288834
2012	17479.583018897032
2013	18184.3080704985
2014	18948.936694667456
2015	15900.327563035642
2016	16741.112048284926
2017	18495.236351115956
2018	20777.206774775183
2019	20799.55978452335
2020	20345.776109413157
2021	23493.474898442655