Year	U.S. dollars (Units)
1994	172.501
1995	413.486
1996	688.363
1997	818.054
1998	869.519
1999	690.373
2000	763.707
2001	820.006
2002	875.188
2003	1034.533
2004	1338.086
2005	1682.527
2006	2052.257
2007	2700.417
2008	3419.915
2009	2890.710
2010	3269.917
2011	4100.982
2012	4518.061
2013	4710.606
2014	4833.664
2015	4090.214
2016	4142.174
2017	4420.410
2018	4800.794
2019	4738.796
2020	4308.286
2021	5055.161
2022	6773.539
2023	8172.574
2024	8825.411
2025	9580.993
2026	10340.697
2027	11144.756
2028	11875.604
2029	12902.506