Year	current US$
1997	9475981.23550415
1998	8401292.08564758
1999	9026880.02586365
2000	9244380.71250916
2001	9076421.97608948
2002	8511503.93486023
2003	9005941.62940979
2004	9593444.34738159
2005	9826758.14628601
2006	10120205.1639557
2007	11052698.6122131
2008	12911923.8853455
2009	14474405.765533399
2010	17058780.1933289
2011	23943687.915802
2012	32222010.135650598
2013	29569411.277771
2014	22390853.4049988
2015	22823227.4055481
2016	25687544.8226929
2017	33837279.3197632
2018	35819364.5477295
2019	42414225.5783081
2020	48138483.0474854
2021	64643125.5340576
2022	53380300.5218506