Year	TDS, current US$
1981	607642.3
1982	917781.1
1983	2099109.2
1984	4108808.4
1985	4324623
1986	5194092
1987	8187432.1
1988	7049149.8
1989	7139875.5
1990	6200783.9
1991	6159938.3
1992	6065725.1
1993	7503722.2
1994	7781857.2
1995	7023770.8
1996	7028056.5
1997	11034277.8
1998	10916293.4
1999	11130038.6
2000	11004545.6
2001	17735205.7
2002	12904737.2
2003	15914139.6
2004	18083279.2
2005	17467585.8
2006	20213299.1
2007	20769440.1
2008	20258497.5
2009	21904282.5
2010	16578439.9
2011	17747435.9
2012	20820431.7
2013	19680075.5
2014	20369314.9
2015	23274593.6
2016	26986248.6
2017	28844022.8
2018	33890476
2019	26841265.4
2020	26432961.4
2021	19497817.6
2022	30115092