Year	U.S. dollars (Units)
1993	2571.858
1994	2950.872
1995	3711.964
1996	4004.761
1997	4076.513
1998	4236.587
1999	3869.052
2000	3839.791
2001	3982.454
2002	4626.832
2003	6341.548
2004	8040.084
2005	9141.855
2006	10700.341
2007	14374.867
2008	18074.643
2009	16591.518
2010	16925.867
2011	18526.876
2012	17519.973
2013	18284.914
2014	18734.166
2015	16399.946
2016	16572.743
2017	17591.574
2018	19508.287
2019	19397.274
2020	19539.836
2021	21732.609
2022	21261.948
2023	24337.251
2024	25934.992
2025	27523.336
2026	28952.303
2027	30291.808
2028	31712.624
2029	33180.935