Year	current US$
1991	800000000
1992	1222000000
1993	1952222222.222222
1994	2184552129.2217326
1995	2090217577.5226998
1996	1853898096.9920197
1997	1584677699.4934986
1998	1735264218.1815474
1999	1342892019.9955277
2000	1404226471.4207935
2001	1431359919.3732605
2002	1262466237.658283
2003	1828801996.337365
2004	2025937934.2288098
2005	1887023593.4664245
2006	1781062355.6581986
2007	2469512195.121951
2008	7197896377.0938835
2009	11697894736.842104
2010	11508070175.438597
2011	14986666666.666666
2012	17758245614.035088
2013	19110175438.59649
2014	19287017543.85965
2015	16333428571.428572
2016	14430000000
2017	11797714285.714285
2018	8560857142.857142
2019	8844000000
2020	8301142857.142858
2021	6249714285.714286
2022	7362400000
2023	7754000000