Year	current US$
1993	6.3597228437149855
1994	6.773599623210208
1995	8.779367888892631
1996	8.113009206989078
1997	10.943788694623688
1998	11.245706792748635
1999	11.717324649149425
2000	10.467332267858112
2001	9.080724157737077
2002	10.636674098415716
2003	13.349188916784362
2004	13.00784788274082
2005	13.897789287262068
2006	14.61334267942271
2007	15.903642294879836
2008	22.048692388835562
2009	20.984829224385074
2010	20.01103795313794
2011	26.637707862785778
2012	20.055118905555858
2013	24.044050910195264
2014	19.685891894381886
2015	25.418018627852057
2016	20.91868947531041
2017	17.91646074430703
2018	16.061664339215362
2019	16.61075768288112
2020	20.46004318566482
2021	17.537134198542553
2022	17.17337180673269