Year	constant 2015 US$
1991	37453.53571676884
1992	38243.14526501604
1993	38511.82017044379
1994	36986.388460959395
1995	35269.2883498556
1996	37691.7511796726
1997	39362.28354768839
1998	38843.26528108807
1999	39270.09172335469
2000	41538.249924836724
2001	46431.95398952187
2002	50024.92404019806
2003	49800.120991471376
2004	56704.72785312916
2005	60127.2935940631
2006	64144.66987685496
2007	64677.84453662598
2008	66134.32820191834
2009	65878.09966328811
2010	68304.75496804231
2011	72497.80195519581
2012	69788.89806065598
2013	69659.8934866992
2014	75504.73915499964
2015	74274.25224894524
2016	77422.20881562748
2017	82583.45191407444
2018	77083.93827448555
2019	82326.11337858945
2020	79286.17790564292
2021	69366.53533382899
2022	72416.15632318935