Year	current US$
1999	516845011.531987
2000	408340574.417856
2001	381821178.372171
2002	448994000.486639
2003	474743404.017911
2004	488889689.086051
2005	491885270.089171
2006	513570258.749097
2007	667491396.601975
2008	751159763.901468
2009	1357268956.60248
2010	1563162507.49248
2011	2486782108.4328
2012	3285313962.10124
2013	3398517135.50423
2014	3471224496.94199
2015	3211355887.90277
2016	3321823469.34923
2017	3299647425.31004
2018	3220619854.72166
2019	4051939714.90976
2020	3721321940.02367
2021	4717077820.12968
2022	4770778312.64388
2023	4181486854.16167