Year	constant 2015 US$
1991	74501.41691450666
1992	76657.89824629108
1993	72336.90361338714
1994	72500.48227346451
1995	72303.29899305564
1996	74950.06264448723
1997	59799.40779729209
1998	59649.675554471585
1999	65691.0728630047
2000	65403.61933241774
2001	67034.88441138198
2002	67859.69835925233
2003	65203.43546456627
2004	66758.9837123031
2005	67819.39677764436
2006	63377.78250816584
2007	65693.31535159641
2008	61179.366392417745
2009	61548.66047171354
2010	60022.97232906371
2011	58058.875959605924
2012	56659.87351933632
2013	56375.257270687376
2014	55204.40441698429
2015	54976.8227788571
2016	54059.70526929699
2017	52056.75600196055
2018	53214.490829404356
2019	52983.42978971376
2020	48150.81370252357
2021	51252.91958773566
2022	53773.94304562541