Year	current US$
1987	11421.628189550425
1988	14393.939393939394
1989	14340.064383962543
1990	8100000000
1991	6600000000
1992	4389999999.999999
1993	3372899505.7660627
1994	3805257453.329618
1995	3146991914.9407463
1996	4104367069.365549
1997	4564998612.716763
1998	4422021460.379316
1999	3310766123.475377
2000	3841197470.27574
2001	3845488049.54325
2002	3942699169.959124
2003	4691026029.408339
2004	6129486644.407346
2005	7745734894.561904
2006	9835753437.506495
2007	13180428281.009426
2008	16963734712.82379
2009	13125932736.980293
2010	14506785061.45285
2011	18220682599.11829
2012	20012285723.975296
2013	19607515375.597435
2014	20946250793.60944
2015	17772607125.765972
2016	17750185255.997208
2017	18257265150.37405
2018	19774694417.044785
2019	19261422992.338253
2020	19067265524.00553
2021	21917202334.75116
2022	27417506378.16337
2023	32838457469.78164