Year	U.S. dollars (Units)
2002	233.433
2003	233.755
2004	254.259
2005	294.396
2006	320.674
2007	381.502
2008	447.746
2009	511.374
2010	631.490
2011	714.700
2012	784.611
2013	754.402
2014	746.922
2015	705.597
2016	617.126
2017	635.789
2018	580.253
2019	586.204
2020	611.268
2021	423.993
2022	422.229