Year	U.S. dollars (Units)
2000	7900.288
2001	8304.592
2002	8404.127
2003	7923.588
2004	8462.146
2005	9327.328
2006	9678.117
2007	10136.305
2008	10498.220
2009	9882.582
2010	10080.443
2011	10885.959
2012	12294.283
2013	13004.425
2014	14149.356
2015	16037.963
2016	17161.725
2017	16383.831
2018	16289.539
2019	15876.323
2020	14624.096
2021	13165.721
2022	13941.386
2023	15084.549
2024	17441.487
2025	19893.274
2026	21010.385
2027	21889.757
2028	22689.037
2029	23543.370