Year	constant 2015 US$
2000	13956.211978481504
2001	14750.042232034011
2002	16447.26980392756
2003	16725.828733544175
2004	18035.477444491546
2005	19080.498291262084
2006	18409.078297141605
2007	15183.529850215244
2008	18956.097635295053
2009	22688.73651103651
2010	26098.711779471454
2011	29150.91272776423
2012	24225.087921496564
2013	34257.76793307796
2014	25806.730533099853
2015	18854.561827288144
2016	19260.927487018245
2017	17778.59247818742
2018	17544.16274828165
2019	18760.438274424323
2020	20125.965095738484
2021	19591.158183499258
2022	18808.069624568925