Year	U.S. dollars (Units)
1992	482.052
1993	1321.756
1994	1979.465
1995	2263.016
1996	2785.404
1997	2932.113
1998	1948.059
1999	1424.156
2000	1898.155
2001	2250.201
2002	2546.779
2003	3190.609
2004	4395.830
2005	5697.621
2006	7416.297
2007	9757.472
2008	12463.807
2009	9160.112
2010	11432.428
2011	14315.938
2012	15303.447
2013	15946.458
2014	14024.384
2015	9266.725
2016	8731.195
2017	10726.771
2018	11257.881
2019	11554.009
2020	10160.571
2021	12635.953
2022	15487.696
2023	13647.814
2024	14391.176
2025	14659.325
2026	14883.648
2027	15145.817
2028	15426.145
2029	15683.454