Year	U.S. dollars (Units)
1993	1194.189
1994	1711.271
1995	2721.005
1996	3379.950
1997	3686.890
1998	4096.127
1999	4151.432
2000	4084.938
2001	4516.219
2002	5358.418
2003	7216.265
2004	8923.191
2005	10426.689
2006	12657.064
2007	16764.936
2008	18273.297
2009	14756.390
2010	14696.814
2011	17484.728
2012	17414.240
2013	19056.283
2014	20253.974
2015	17403.806
2016	18290.293
2017	20430.567
2018	23176.358
2019	23584.260
2020	23546.320
2021	27716.897
2022	28136.261
2023	29838.985
2024	31854.782
2025	33346.951
2026	35015.700
2027	36758.507
2028	38651.425
2029	40707.171