Year	constant 2015 US$
1993	535.9524226927149
1994	486.64638937777886
1995	508.67513213004554
1996	532.4540205519087
1997	523.097332134465
1998	555.5341837330012
1999	533.9322052077789
2000	507.7044367373734
2001	515.5203234694584
2002	523.7230892246844
2003	544.6330236708036
2004	566.80566269461
2005	594.2282751191934
2006	591.2802407581454
2007	616.6878530139458
2008	635.9072609329717
2009	650.5602304632458
2010	664.0881058669454
2011	633.7066675942615
2012	617.3894796947325
2013	598.5687658016811
2014	598.2376966877044
2015	576.995127977957
2016	579.5000787895987
2017	570.2391718349846
2018	561.3105984270459
2019	582.4016672307425
2020	563.04016119867
2021	574.2587694001638
2022	579.1921424226487
2023	576.1452916699279