Year	U.S. dollars (Units)
1992	1252.792
1993	1114.104
1994	1533.721
1995	1034.931
1996	1429.059
1997	1396.112
1998	1514.669
1999	1210.965
2000	1079.610
2001	1286.951
2002	1529.813
2003	1880.217
2004	2459.175
2005	3232.491
2006	3979.115
2007	4896.501
2008	6590.856
2009	5350.621
2010	6033.415
2011	6485.981
2012	6951.407
2013	7994.708
2014	8333.161
2015	5953.752
2016	5037.653
2017	5785.291
2018	6357.962
2019	6838.218
2020	6536.527
2021	7332.084
2022	7892.727
2023	7820.257
2024	7557.795
2025	7790.189
2026	8118.961
2027	8489.476
2028	8934.404
2029	9357.893