Year	U.S. dollars (Units)
1992	207.976
1993	148.155
1994	245.851
1995	329.934
1996	396.495
1997	379.056
1998	344.404
1999	258.467
2000	280.635
2001	309.913
2002	323.343
2003	382.888
2004	436.496
2005	478.770
2006	546.621
2007	725.487
2008	971.678
2009	876.933
2010	884.846
2011	1131.471
2012	1189.517
2013	1295.225
2014	1292.621
2015	1132.843
2016	1131.841
2017	1254.510
2018	1321.954
2019	1466.956
2020	1270.961
2021	1390.900
2022	1717.714
2023	1843.190
2024	1921.514
2025	2029.441
2026	2119.133
2027	2194.621
2028	2257.322
2029	2323.418