Year	current US$
1987	752.3183608028809
1988	936.6058048488502
1989	1018.0288066535534
1990	651.5036732260204
1991	652.8074752874295
1992	603.3520152964379
1993	596.9835856125762
1994	576.447110453392
1995	585.9323641611346
1996	600.598157828584
1997	623.0026523676387
1998	623.2161328359849
1999	702.4807440888727
2000	558.2268023770001
2001	456.7062895115829
2002	383.3430679907423
2003	396.3779790266329
2004	465.11988694402487
2005	546.7768501855516
2006	654.283837283285
2007	830.407694204322
2008	1082.286025016987
2009	1213.2653281638804
2010	1742.3492564507694
2011	2051.129515164182
2012	2267.6232753551167
2013	2419.718743879961
2014	2628.4600542125368
2015	2753.971058257975
2016	2704.677188893804
2017	1916.7646252081358
2018	1604.2586414859227
2019	1795.2017684565726
2020	1759.3074705367767
2021	1993.4244778720633
2022	2276.1612330647745
2023	2496.107757580361